//here you place the ids of every element you want.
var ids=new Array('div1');

function switchid(id,aId)
{	
	if(document.getElementById(aId).innerHTML == "[+]")
	{
		showdiv(id);
		document.getElementById(aId).innerHTML = "[-]"
	}
	else
	{
		hidediv(id);
		document.getElementById(aId).innerHTML = "[+]"
	}		
}

function hidediv(id)
{
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'none';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'none';
		}
		else { // IE 4
			document.all.id.style.display = 'none';
		}
	}
}

function showdiv(id) {
	//safe function to show an element with a specified id
		  
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'block';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'block';
		}
		else { // IE 4
			document.all.id.style.display = 'block';
		}
	}
}