function initPage()
{
	var page = document.getElementById("page-box");
	var mainHeight = document.documentElement.clientHeight;
	if ( mainHeight > page.offsetHeight )
	{
		page.style.height = mainHeight + "px";
	}
}

if (window.addEventListener){
	window.addEventListener("load", initPage, false);
	window.addEventListener("resize", initPage, false);
}
else if (window.attachEvent){
	window.attachEvent("onload", initPage);
	window.attachEvent("onresize", initPage);
}