function openWindow(url,z) {

var winattribs = '';

if (z==1)
 {
 	winattribs = 'width=500,height=155,left=10,top=10';
 }
else
 {
 	winattribs = 'width=500,height=310,left=10,top=10';
 }
	popupWin = window.open(url, 'Preview', winattribs);
	popupWin.close();
	popupWin = window.open(url, 'Preview', winattribs);
}

function Unload() {
	popupWin = window.open('', 'Preview');
	popupWin.close();
}