function rllovr(btn, btnsrc)
{
	document.getElementById(btn).src=btnsrc;
}
function rllout(btn, btnsrc)
{
	document.getElementById(btn).src=btnsrc;
}
function hideBK()
{
	document.getElementById('backImage').style.visibility='hidden';
	document.getElementById('textFilter').style.visibility='visible';
	document.getElementById('textBox').style.visibility='visible';
	document.getElementById('sideBox1').style.visibility='visible';
	document.getElementById('sideBox2').style.visibility='visible';
	document.getElementById('sideBox3').style.visibility='visible';
}
function showBK()
{
	document.getElementById('backImage').style.visibility='visible';		
	document.getElementById('textFilter').style.visibility='hidden';
	document.getElementById('textBox').style.visibility='hidden';
	document.getElementById('sideBox1').style.visibility='hidden';
	document.getElementById('sideBox2').style.visibility='hidden';
	document.getElementById('sideBox3').style.visibility='hidden';
}
function restoreBK()
{
	document.getElementById('backImage').style.visibility='visible';
	document.getElementById('textFilter').style.visibility='visible';
	document.getElementById('textBox').style.visibility='visible';
	document.getElementById('sideBox1').style.visibility='visible';
	document.getElementById('sideBox2').style.visibility='visible';
	document.getElementById('sideBox3').style.visibility='visible';
}