//here you place the ids of every element you want.
var ids=new Array('a1','a2');

function switchid(id){	
	hideallids();
	showdiv(id);
	
	
	if (document.getElementById) // DOM3 = IE5, NS6
  	{ 
		if(id == 'a1')
		{
			document.getElementById("ONE").innerText = "Advanced location search";
			document.getElementById("ONE").textContent = "Advanced location search";
			document.getElementById("advTabBar").style.backgroundColor  = "#A27C16";
		}
		else
		{
			document.getElementById("ONE").innerText = "Advanced zipcode search";
			document.getElementById("ONE").textContent = "Advanced zipcode search";
			document.getElementById("advTabBar").style.backgroundColor  = "#686C56";
		}
	}	
	
}

function hideallids(){
	//loop through the array and hide each element by id
	for (var i=0;i<ids.length;i++){
		hidediv(ids[i]);
	}		  
}

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';
		}
	}
}