function doAll() {
			var x = document.forms['myForm'].all.checked;
			var fs = document.forms['myForm'].elements['copy_list']; 
			for (var i = 0; i < fs.length; i++) { 
				if (x == true) { 
					fs[i].checked = true; 
				} 
				else if (x == false) { 
					fs[i].checked = false; 
				}
			}