var win = "";
   var emptyGuid = "00000000-0000-0000-0000-000000000000";

function ShowContact(){
    var width = 500;
    var height = 500;
    var left = parseInt((screen.availWidth/2) - (width/2));
    var top = parseInt((screen.availHeight/2) - (height/2));
    
     if (win == null || win == "") {
            if(domainId !=emptyGuid){
          win = window.open("Contact.aspx", "Contact","left=" + left + ",top=" + top + ",width=" + width + ",height=" + height + ",toolbar=1,menubar=1,resizable=1,scrollbars=1" );      
         win.focus();
         trackOpen(win);
         }
     } else{
         win.close();   
           if(domainId !=emptyGuid){
           win = window.open("Contact.aspx", "Contact","left=" + left + ",top=" + top + ",width=" + width + ",height=" + height + ",toolbar=1,menubar=1,resizable=1,scrollbars=1" );           
          win.focus();
          trackOpen(win);
          }
     }
}