var win = null;
function zWindow(page,name,w,h,scroll){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings ='height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable';
win = window.open(page,name,settings);
	if(win.window.focus){
	win.window.focus();
	}
}