// Drop Down Menu
var tab = 0;
var menu = new Array("services","physicians","medical","contact");

// expand() makes selected layer taller (height property)
function expandTab(id){
	tab=document.getElementById(id);
	tab.style.visibility='visible';
}

// contract() makes selected layer shorter (height property)
function contractTab(){
	if(tab){
		tab.style.visibility = 'hidden';
	}
}

function closeAll(){
	var i=0;
	for(i=0; i<menu.length; i++) {						
		tab = document.getElementById(menu[i]);
		tab.style.visibility = "hidden";
	}
}