function height() {

	var ftext=(document.getElementById('bgimage').offsetHeight);
	ftext=ftext-150;
	if(ftext>500)
	{
		ftext=ftext-48;
		document.getElementById('leftnav').style.height = ftext + 'px';
	}
	else
	{
		document.getElementById('leftnav').style.height = '500px';
	}
	

}


function height() {/* 

	var ftext=(document.getElementById('textbox').offsetHeight);
	if(ftext<500)
	{
		document.getElementById('leftnav').style.height = '560px';
	}
	else
	{*/
		var ftext=(document.getElementById('bgimage').offsetHeight);
		ftext=ftext-198;
		document.getElementById('leftnav').style.height = ftext + 'px';
	}


function viewable(id) {

	var d = document.getElementById(id); 
 	for (var i = 1; i<=4; i++) 
	{
		if (document.getElementById('menu'+i))
		{
			document.getElementById('menu'+i).style.display='none';
		}
	}
		
	 if (d) 
	{	
		d.style.display='block';
	}
}