function show(target){
		if(document.getElementById(target+'_sub')){
			document.getElementById(target+'_sub').style.display='';
		}
		document.getElementById(target+'_img').src='images/'+target+'_button2.gif';
	}
	
	function hide(target){
		if(document.getElementById(target+'_sub')){
			document.getElementById(target+'_sub').style.display='none';
		}
		document.getElementById(target+'_img').src='images/'+target+'_button.gif';

	}