Hello,
Kindly take a look at the code (use view source) of this webpage http://www.qestinfosystems.com/oaaco.

The "About Us" button is supposed to have a dropdown menu but for a reason/reasons bearting me, the dropdown fails to show up on mouse hover.
See the css file http://www.qestinfosystems.com/oaaco/mainstyle.css
Advice needed please.


See Css code below:

body {
	background-position: center top;
	background: #0000F2 url('PNGS/bodybground2.png') no-repeat center
top;
	width: auto;
	margin: 0px;
}
#navdiv {
	margin: 100px 0px 0px 0px;
	height: 0px;
	width: 970px;
	color: #FFFFFF;
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 8pt;
	clip: rect(0px, auto, auto, auto);
	list-style-type: none;
	float: none;
	clear: both;
	display: block;
}
ul#navdiv {
	list-style-type: none;
	width: 970px;
	padding-right: 0px;
	padding-bottom: 0px;
	padding-left: 0px;
	margin-top: 17px;
	top: 0px;
	left: 34px;
}
#navdiv li {
	background-image: url('PNGS/buttonbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center center;
	height: auto;
	text-align: center;
	line-height: 54px;
	float: left;
	width: 119px;
	margin-left: 1px;
	margin-top: 0px;
	margin-bottom: 0px;
}
#navdiv li a:link {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 12px;
	vertical-align: middle;
	text-align: center;
	background-image: url('PNGS/buttonbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center center;
	text-decoration: none;
	color: #FFFFFF;
	width: 120px;
	height: 32px;
}
#navdiv li a:visited {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 12px;
	vertical-align: middle;
	text-align: center;
	background-image: url('PNGS/buttonbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center center;
	text-decoration: none;
	color: #FFFFFF;
}

#navdiv li a:hover {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 12px;
	font-weight: normal;
	text-decoration: none;
	vertical-align: middle;
	text-align: center;
	background-image: url('PNGS/buttonbgroundhover.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center;
	color: #FFFFFF;
}
#navdiv li a:active {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 12px;
	vertical-align: middle;
	text-align: center;
	background-image: url('PNGS/buttonbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center center;
	text-decoration: none;
	color: #FFFFFF;
}

#mainpagediv {
	background-color: #000040;
	width: 970px;
	height: auto;
	margin: 0px;
}
#navdiv li ul.submenu {
	background-position: left top;
	list-style-type: none;
	display: none;
	padding: 0px;
	margin: 0px;
	position: absolute;
	width: 132px;
	top: 178px;
	background-repeat: no-repeat;
	background-attachment: inherit;
	float: left;
	left: 179px;
	height: 294px;
}
#navdiv li ul.submenu li {
	padding: 0px;
	margin: 0px;
	background-image: url('PNGS/submenubuttonbground.png');
	background-repeat: no-repeat;
	background-position: left top;
	text-align: center;
	line-height: 20px;
	width: 118px;
	display: block;
	clear: left;
	float: left;
}
#navdiv li ul.submenu li a {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 12px;
	background-image: url('PNGS/submenubuttonbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center center;
	vertical-align: middle;
	text-align: center;
	color: #FFFFFF;
	text-decoration: none;
}
#navdiv li ul.submenu li a:link {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 12px;
	background-image: url('PNGS/submenubuttonbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center center;
	vertical-align: middle;
	text-align: center;
	color: #FFFFFF;
	text-decoration: none;
	clear: left;
	position: relative;
	z-index: 1000;
	width: 118px;
}
#navdiv li ul.submenu li a:hover {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 12px;
	background-image: url('PNGS/submenubuttonbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center center;
	vertical-align: middle;
	text-align: center;
	color: #FFFFFF;
	text-decoration: none;
	clear: left;
	position: relative;
	z-index: 1000;
	width: 118px;
}
#navdiv li ul.submenu li a:active {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 12px;
	background-image: url('PNGS/submenubuttonbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center center;
	vertical-align: middle;
	text-align: center;
	color: #FFFFFF;
	text-decoration: none;
	clear: left;
	position: relative;
	z-index: 1000;
	width: 118px;
}
#contentdiv {
	float: left;
	width: 612px;
	height: auto;
	margin: 15px 2px 15px 5px;
	padding: 0px;
}
#banner img {
	margin: 0px;
	width: 611px;
	height: 250px;
}
#content p {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 10pt;
	font-weight: normal;
	color: #FFFFFF;
	line-height: 15px;
	vertical-align: top;
	text-align: left;
}
p {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 8pt;
	color: #FFFFFF;
	line-height: 20px;
	vertical-align: top;
	text-align: left;
	font-weight: normal;
	font-style: normal;
	white-space: normal;
}
#banner {
	border: 1px solid #CCCCCC;
	height: 250px;
	width: 612px;
}
#paragraphdiv {
	padding: 5px;
	border: 1px dashed #0000CC;
	width: 612px;
	height: auto;
	margin-top: 5px;
	margin-bottom: 5px;
}
#sidebardiv {
	margin: 15px 2px 15px 5px;
	background-position: center top;
	width: 335px;
	height: auto;
	float: left;
	background-image: url('PNGS/sidebarheaderbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
}
#sidebar1div {
	margin: 0px;
	background-position: center top;
	border: 1px dashed #0000CC;
	width: 338px;
	height: auto;
	float: left;
	padding-right: 5px;
	padding-left: 5px;
	background-image: url('PNGS/sidebarheaderbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	padding-top: 2px;
}
#sidebar2div {
	margin: 15px 0px 0px 0px;
	background-position: center top;
	border: 1px dashed #0000CC;
	width: 338px;
	height: auto;
	float: left;
	padding-right: 5px;
	padding-left: 5px;
	background-image: url('PNGS/sidebarheaderbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	padding-top: 2px;
}
#sidebar3div {
	margin: 15px 0px 0px 0px;
	background-position: center top;
	border: 1px dashed #0000CC;
	width: 338px;
	height: auto;
	float: left;
	padding-right: 5px;
	padding-left: 5px;
	background-image: url('PNGS/sidebarheaderbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	padding-top: 2px;
}
h1 {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 20pt;
	font-weight: bolder;
	color: #FF860D;
	vertical-align: top;
	text-align: left;
	font-style: italic;
	font-variant: normal;
}
h3 {
	font-family: Verdana, Geneva, Tahoma, sans-serif;
	font-size: 14px;
	font-weight: bold;
	color: #FFFFFF;
	line-height: normal;
	vertical-align: top;
	text-align: left;
}
#threecolumndiv {
	padding: 15px 6px 15px 6px;
	width: 960px;
	height: 200px;
	border: 1px dashed #0000FF;
	margin-right: 5px;
	margin-left: 5px;
	margin-bottom: 5px;
}
#threecolumnleftdiv {
	width: 315px;
	height: 200px;
	float: left;
	border-right-style: dashed;
	border-right-color: #0000F2;
	border-right-width: 1px;
	padding-right: 5px;
	padding-left: 5px;
	background-image: url('PNGS/threecolumnheaderbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center top;
	padding-top: 3px;
}
#threecolumnmiddlediv {
	width: 315px;
	height: 200px;
	float: left;
	border-right-style: dashed;
	border-right-color: #0000F2;
	border-right-width: 1px;
	padding-right: 5px;
	padding-left: 5px;
	background-image: url('PNGS/threecolumnheaderbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center top;
	padding-top: 3px;
}
#threecolumnrightdiv {
	width: 315px;
	height: 200px;
	float: left;
	padding-right: 5px;
	padding-left: 5px;
	background-image: url('PNGS/threecolumnheaderbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center top;
	padding-top: 3px;
}
#footerdiv {
	width: 970px;
	height: 25px;
	background-color: #FFCC00;
}
.footertext {
	color: #000066;
	vertical-align: middle;
	text-align: center;
}
#footerinnerdiv {
	width: 960px;
	height: 25px;
	background-color: #FFCC00;
	border: 1px dashed #000066;
	margin: 5px;
	background-image: url('PNGS/footerinnerdivbground.png');
	background-repeat: no-repeat;
	background-attachment: scroll;
	background-position: center bottom;
}

Emiola.

I am not saying that this is what is causing the problem (though it may be) but you have 2 id's named the same (you can only use one id per page, otherwise it needs to be a class):

<div id="navdiv">
			<!--about us submenu list ends-->
		<ul id="navdiv">
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