var win=null;	

function popUp(url,title,w,h)
{
	if (w>(screen.width-100))
	w=screen.width-100;
	if (h>(screen.height-100))
		h=screen.height-100;

	myleft = (screen.width/2)-(w/2);
	if (myleft<0)
		myleft=0;

	mytop = (screen.height/2)-(h/2);
	if (mytop<0)
		mytop=0;

	settings = 'height='+h+',width='+w+',top='+mytop+',left='+myleft+',scrollbars=yes,resizable=yes';

	win = window.open(url,"PopupTearSheet",settings);

}