function exp(layid){
	if(document.getElementById){
		 // Netscape 6 and IE 5 code goes here
		 if(document.getElementById(layid).style.display == "none"){
		 document.getElementById(layid).style.display = "";
		 }
		 else{
		 document.getElementById(layid).style.display = "none";
		 }
	}else if(document.all){
		 // IE 4 code goes here
		 if(document.all[layid].style.display == "none"){
		   document.all[layid].style.display = "";
		 }
		 else{
		  document.all[layid].style.display = "none";
		 }
	}else if(document.layers){
		//Netscape 4 code goes here
		alert('<?echo OLD_BROWSER; ?>');
	}
}