function open_up(url,name,w,h)
{
	if (w <= 0) w = 800;
	if (h <= 0) h = 600;
 	var left = (window.screen.width/2)  - (w/2);
	var top  = (window.screen.height/2) - (h/2);
	if (left < 0) left = 20;
	if (top < 0) top = 50;

      name0 = window.open(url, name,'width='+w+',height='+h+',directories=no,location=no,status=no,toolbar=no,scrollbars=no,leftmargin=0,topmargin=0,resizeable=no,screenX='+left+',screenY='+top+',left='+left+',top='+top);
	name0.focus();
}