function link(mylink){

if (!window.focus)return true;
var href;

if (typeof(mylink) == 'string')
   href=mylink;
     
 else
   href=mylink.href;

var x = parseInt((screen.width-750)/2);
var y = parseInt((screen.height-550)/2);
var win = window.open(href, 'pop', 'left='+x+',top='+y+',height='+550+',' +'width='+750+',status=yes,' +'toolbar=no,resizable=no,menubar=no,location=no'); 

}