var browserHeight;
if (self.innerHeight) // all except Explorer
{
	browserHeight = self.innerHeight;
}
else if (document.documentElement && document.documentElement.clientHeight)
	// Explorer 6 Strict Mode
{
	browserHeight = document.documentElement.clientHeight;
}
else if (document.body) // other Explorers
{
	browserHeight = document.body.clientHeight;
}

var headerHeight = document.getElementById("header").offsetHeight;
var contentwrapperHeight = document.getElementById("contentwrapper").offsetHeight;
var footerHeight = document.getElementById("footer").offsetHeight;
var docHeight = headerHeight + contentwrapperHeight + footerHeight ;

var wrapperHeight;
if (docHeight < browserHeight)	{
	wrapperHeight = browserHeight + 100;
	}
else	{
	wrapperHeight = docHeight + 100;
	}
wrapperHeight = wrapperHeight + 100;


function alertBrowserHeight()	{
	alert("browserheight: " + browserHeight )
}
function alertDocHeight()	{
alert("headHeight: " + headerHeight + " contentwrapperHeight: " + contentwrapperHeight + " footerHeight: " + footerHeight + " docHeight: " + docHeight);
}
function alertWrapperHeight()	{
	alert("wrapperHeight: " + wrapperHeight )
}