function pop(url){
	var centerL = (screen.availWidth - 780)/2;
	var centerT = (screen.availHeight - 475)/2;
	var center = 'left=' + centerL + ',top=' + centerT;
	var win = window.open(url,'pop','width=780,height=475,scrollbars,resizable,menubar,'+center);
	win.focus();
	return false;
}