function getCentered()
{
	var height = window.innerHeight;
	if (typeof(height) != 'number')
	{
		height = document.body.clientHeight;
	}
	if(height > 700)
	{
		var marg = (height - 600.0)/2.0; 
		eval('document.getElementById("pageMain").style.marginTop = "' + marg + 'px"');
		return false;
	}
	else
	{
		return false;
	}
	
}