var ids=new Array('doc1','doc2');
 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';
 		}
 	}
 }