function addListenersTabs(exception){
	for (i=1;i<=5;i++){
		if (i != exception){
			document.getElementById('tab'+i).onmouseover = checkState;
			document.getElementById('tab'+i).onmouseout = checkState;
		}else{
			document.getElementById('tab'+i).src = document.getElementById('tab'+i).src.replace('.gif','_over.gif');
		}
	}
}

function addListenerTo(id){
	document.getElementById(id).onmouseover = checkState;
	document.getElementById(id).onmouseout = checkState;
}

function checkState(event){
	var e = window.event || event;
	var tgt = (e.target)?e.target:e.srcElement;

	if (tgt.src.indexOf('_over') && e.type == 'mouseout'){
		new_src = tgt.src.replace('_over','');
	}else{
		new_src = tgt.src.replace('.gif','_over.gif');
	}
	
	tgt.src = new_src;
}