var win = null;
function popup(mypage, w, h) {
	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=no,resizable';
	win = window.open(mypage,'',settings)
	if(win.window.focus) {
		win.window.focus();
	}
}


function getById(name){
    if (document.getElementById) return document.getElementById(name);  // Mozilla, Safari, W3C

    else if (document.all) return document.all[name];                   // Internet Explorer
    else if (document.layers) return document.layers[name];             // Netscape 4
    return null;
}