function preloader() 
{
	heavyImage = new Image(); 
	heavyImage.src = "im/sub_nav_button2.jpg";
}

function hideall() {
	document.getElementById('tab1').style.display = 'none';
	document.getElementById('tab2').style.display = 'none';
	document.getElementById('tab3').style.display = 'none';
}	

function showdiv(div) {
	hideall()
	document.getElementById('button_tab1').className='button1 pointer';
	document.getElementById('button_tab2').className='button3 pointer';
	document.getElementById('button_tab3').className='button3 pointer';
	
	if(div != 'tab1')
		document.getElementById('button_'+div).className='button2 pointer';
	else 
		document.getElementById('button_'+div).className='button1_hightlighted pointer';
	document.getElementById(div).style.display = 'block';
}

function goto(URL) {
		window.location = URL;
}