function popup(url, width, height) {
        width1=width/2;
		height1=height/2;
		x=screen.availWidth/2-width1;
		y=screen.availHeight/2-height1;
		var Win = window.open(url,"displayWindow",'width=' + width + ',height=' + height + ',resizable=0, scrollbars=1, menubar=no,status=1, left='+x+', top='+y );
		Win.focus();
};