function show(element) {
		if(document.getElementById(element)!=null){
			if(document.getElementById(element).style.display=='none'){
				document.getElementById(element).style.display = '';
			}
		}
	}
	
	function hide(element) {
		if(document.getElementById(element)!=null){
			if(document.getElementById(element).style.display==''){
				document.getElementById(element).style.display = 'none';
			}
		}
	}