function over(imgname,imgsrc) {
document[imgname].src=imgsrc;
}

function showme(id){
	var menu1 = document.getElementById("sub1");
	var menu2 = document.getElementById("sub2");
	var menu3 = document.getElementById("sub3");
	menu1.style.visibility='hidden';
	menu2.style.visibility='hidden';
	menu3.style.visibility='hidden';
	var menu = document.getElementById(id);
	menu.style.visibility='visible';
}

function hideme(){
	var menu1 = document.getElementById("sub1");
	var menu2 = document.getElementById("sub2");
	var menu3 = document.getElementById("sub3");
	menu1.style.visibility='hidden';
	menu2.style.visibility='hidden';
	menu3.style.visibility='hidden';

}