function OpenPopup(arq, width, height, scroll) 
     {    
  
         var URL = arq 
         var W = width 
         var H = height 
         var S = scroll 
  
          var Wpopupsize =(W/2); 
          var Hpopupsize =(H/2); 
          var CenterPopUpX = (screen.width/2)-(Wpopupsize); 
          var CenterPopUpY = (screen.height/2)-(Hpopupsize); 
          var pos = "left="+CenterPopUpX+",top="+CenterPopUpY; 
          var desktop = window.open( ""+URL, "_blank", "width="+W+",height="+H+",toolbar=no,location=no,status=no,menubar=no,scrollbars="+S+",resizable=no,"+pos); 
 
}