function abre_hotsite(arq, width, height){   
    var URL = arq 
    var W = width 
    var H = height 
    var S = 'yes' 

     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, "preview", "width="+W+",height="+H+",toolbar=no,location=no,status=no,menubar=no,scrollbars="+S+",resizable=no,"+pos); 
}