search Property
http://msdn.microsoft.com/workshop/author/dhtml/reference/properties/search.asp

You'll have to do your own parsing to extract information from the string.

Hi,

Use this following Function to get value of tab

var tabvalue = getQueryVariable("tab");

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function getQueryVariable(variable)
{
 var query = window.location.search.substring(1);
 var vars = query.split("&");
 for (var i=0;i<vars.length;i++)
 {
   var pair = vars[i].split("=");
   if (pair[0] == variable)
   {
     return pair[1];
   }
 }  
}