function expander(id){
	if(document.getElementById("div"+id).style.height!='100%'){
		for(i=1;i<=4;i++){
			if(i==id){
				openDiv(i);
			}
			else{
				if(document.getElementById("div"+i)){
					closeDiv(i);
				}
			}
		}
	}else{
		closeDiv(id);
	}
}

function openDiv(id){
	if(document.getElementById("div"+id)) {
		document.getElementById("div"+id).style.display='block';
		document.getElementById("div"+id).style.visibility = 'visible';
		document.getElementById("div"+id).style.height='100%';
	}
}

function closeDiv(id){
	if(document.getElementById("div"+id)) {
		document.getElementById("div"+id).style.height='0';
	}
}