String.prototype.reverse=function(){
	return this.split("").reverse().join("");
}

function showMenu(obj) {
		elem=obj.getElementsByTagName('ul');
		for (index in elem) if(elem[index].className=='visible'){ elem[index].className='none'; } else elem[index].className='visible';
		
	}


function showDivIn(obj, id) {
	elements=document.getElementById(obj).getElementsByTagName('div');
	for (index in elements) elements[index].className='hidden';
	document.getElementById(id).className='visible';
}

function over(obj) {
	hover=obj.src;
	hover=hover.reverse();
	hover=hover.replace('_', '_revoh_');
	hover=hover.reverse();
	obj.src= hover;
}
function out(obj) {
	hover=obj.src;
	hover=hover.reverse();
	hover=hover.replace('_revoh_','_' );
	hover=hover.reverse();
	obj.src=hover;
}