function sizeViewport() 
	{
		var y,z;
   		if (self.innerHeight) // all except Explorer    
		{
 			y = self.innerHeight;
      		}
		else if (document.documentElement && document.documentElement.clientHeight)
  		{
			y = document.documentElement.clientHeight;

		}  
		else if (document.body)
		{
			y = document.body.clientHeight;
		}
		z = document.getElementById('gp_contentitems').offsetHeight;
		if(z + 515 > y) return z; else return y - 515;
  	}

	function setHeight()
	{
		document.getElementById('gp_contentitems').style.height = sizeViewport() + 'px';
		
	}

	window.setTimeout("setHeight()", 1000);