add below css styles to your code in the page where you are having menu items:
<style type="text/css">
.item{background-image:url(../images/sprite.png) !important; background-repeat:no-repeat !important;}
.item:hover{background-image:url(../images/sprite-hover.png) !important; background-repeat:no-repeat !important;}
.item:visited{background-image:url(../images/sprite-hover.png) !important; background-repeat:no-repeat !important;}
.shift{ background-position:2px -112px !important; }
</style>
replace menu code like below
<table style="width: 100%" align="center">
<tr>
<td align="center">
<div class="container">
<section class="color-4">
<nav class="cl-effect-17" align="center">
<a href="adminCS.aspx" data-hover="MyWorkplace" class="item shift adminCSactive">MyWorkplace</a>
<a href="admincontractInfo.aspx" data-hover="Contract Info" class="item shift contractinfoasctive">Contract Info</a>
<a href="adminwOutContract.aspx" data-hover="W/ out Contract" class="item shift woutcontractactive">W/ out Contract</a>
<a href="adminbatchProcess.aspx" data-hover="Batch Process" class="item shift adminbatchprocessactive">Batch Process</a>
<a href="Admin.aspx" data-hover="Administrator" class="item shift adminactive">Administrator</a>
</nav>
</section>
</div>
<br />
</td>
</tr>
</table>
add below css style in every page which you are redirecting:
like for adminCS.aspx page add below style:
<style type="text/css">
.<pre>adminCSactive {
color: #fff;
background-color: #7ac144;
background-image: url(images/sprite-hover.png) !important;
background-repeat: no-repeat !important;
}
</style></pre>
for admincontractInfo.aspx page:
<style type="text/css">
.<pre>contractinfoasctive {
color: #fff;
background-color: #7ac144;
background-image: url(images/sprite-hover.png) !important;
background-repeat: no-repeat !important;
}
</style></pre>
for adminwOutContract.aspx page:
<style type="text/css">
.<pre>woutcontractactive{
color: #fff;
background-color: #7ac144;
background-image: url(images/sprite-hover.png) !important;
background-repeat: no-repeat !important;
}
</style></pre>
for adminbatchProcess.aspx page:
<style type="text/css">
.adminbatchprocessactive{
color: #fff;
background-color: #7ac144;
background-image: url(images/sprite-hover.png) !important;
background-repeat: no-repeat !important;
}
</style>
for Admin.aspx page:
<style type="text/css">
.adminactive{
color: #fff;
background-color: #7ac144;
background-image: url(images/sprite-hover.png) !important;
background-repeat: no-repeat !important;
}
</style>