//here you place the ids of every element you want.

var ids=new Array('a1','a2');



function switchid(id){	

	hideallids();

	showdiv(id);

}



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';

		}

	}

}