function verAlign()
{
		var main = document.getElementById("main");
		main.style.marginTop = main.parentNode.offsetHeight > main.offsetHeight ? ((main.parentNode.offsetHeight - main.offsetHeight)/2 + "px") : "0"
}
if (window.addEventListener) window.addEventListener("load", verAlign, false);
else if (window.attachEvent) window.attachEvent("onload", verAlign);
if (window.addEventListener) window.addEventListener("resize", verAlign, false);
else if (window.attachEvent) window.attachEvent("onresize", verAlign);