var 	wHeight, height;
function howHigh() {

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

function imagine() {
	if (typeof(width) == "undefined") { howHigh(); }
	var img = '<img src="images/spacer.gif" width="1" height="' + wHeight + '" ';
	img += 'alt=" " border="0" align="left">';
	document.write(img);
}