var viewportwidth;
 var viewportheight;
 
 // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
 
 if (typeof window.innerWidth != 'undefined')
 {
      viewportwidth = window.innerWidth,
      viewportheight = window.innerHeight
 }
 
// IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)

 else if (typeof document.documentElement != 'undefined'
     && typeof document.documentElement.clientWidth !=
     'undefined' && document.documentElement.clientWidth != 0)
 {
       viewportwidth = document.documentElement.clientWidth,
       viewportheight = document.documentElement.clientHeight
 }
 
 // older versions of IE
 
 else
 {
       viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
       viewportheight = document.getElementsByTagName('body')[0].clientHeight
 }

var vpheight = (viewportheight - 65); 
var vpheight2 = (viewportheight - 115);

var params = { autoOpen: false,
				modal: true,
				height: vpheight,
				width: 850,
				close: Closefunction
 };

$(document).ready(function(){
    $("#shippingestimate").dialog(params);
  });

function OpenEstimate(pageurl)
{
	 $("#shippingestimate").html('<iframe id="shippingmodal" width="96%" height="'+ vpheight2 +'" marginWidth="0" marginHeight="0" frameBorder="0" scrolling="auto" />').dialog("open");   
	 $("#shippingmodal").attr("src",pageurl);   
	 return false;	
}

function Closefunction()
{
	var returnvalue = $("#returnvalue").val();
	if (returnvalue != '')
	{
		location.href=returnvalue;
	} else {
		location.href=location.href;
	}
	
}