function popUp(url,name,width,height){
 	if (document.all){
    	var x = window.screenLeft;
      	var y = window.screenTop;
      	var w = window.screen.width;
      	var h = window.document.body.offsetHeight;
 	} else {
   		var x = window.screenX;
   		var y = window.screenY;
   		var w = window.outerWidth;
   		var h = window.outerHeight;
 	}
 	var cntx = x + Math.round((w - width) / 2);
 	var cnty = y + Math.round((h - height) / 2);
	
 	var aa = window.open (url, name, 'resizable=yes,scrollbars=yes,left=' + cntx + ',top=' + cnty + ',width=' + width + ',height=' + height);
}