function WinOpen(num){
   var height=0;
   var width=0;
   var left=0;
   var top=0;
   var screenX=0;
   var screenY=0;
   var file="";
   var winName="";
   
   if( num ==1 ) {
   
   height=566;
   width=800;
   file="/SizeChart/Size.htm";
   winName="SizeChart";
  
   }
  if(num==2){
   
     height=300;
   width=300;
   file="/Chat/chat.html";
   winName="Chat"
    left=300;
    top=200;
    screenX=300;
    screenY=300;

    }
    
    var settings ="toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,copyhistory=no,resizable=no,"
     settings +="left="+left+",top="+top+",screenX="+screenX+",screenY="+screenY+",";         
     settings +="height="+height+",width="+width;
     
     var newWin = window.open(file,winName,settings);     
       newWin.focus();
    
    }