function toggle(list){ 
var listElementStyle=document.getElementById(list).style; 
if (listElementStyle.display=="none")
{
	listElementStyle.display="block"; 
}
else
{ 
	listElementStyle.display="none"; 
} 

} 

var image = false; 

function swapImage(x){
x.src = (x.src== 'http://www-scf.usc.edu/~vivekana/summer/images/redarrow.png')?'http://www-scf.usc.edu/~vivekana/summer/images/redarrow1.png':'http://www-scf.usc.edu/~vivekana/summer/images/redarrow.png';
image = (x.src == 'http://www-scf.usc.edu/~vivekana/summer/images/redarrow1.png');
}