function principle() 
{ 
window.open('principal.html','prin','width=700,height=700,resizable=no'); 
}

function contact() 
{ 
window.open('contact/contactus.html','cont','width=700,height=550,resizable=no'); 
}

var bus = 'none';
var sal = 'none';

function showhide(layer_ref) {

var div = document.getElementById(layer_ref);
layer=layer_ref+'cap';
var div2=document.getElementById(layer);
if(div.style.display=='none'){
	div.style.display = 'block';
	}else{
	div.style.display='none';
}
if(div2.style.display=='none'){
	div2.style.display = 'block';
}else{
	div2.style.display='none';
}
}