function clear(){
			document.getElementById('username').onfocus=function(){
				document.getElementById('username').value="";
			}
			document.getElementById('username').onblur=function(){
				if(document.getElementById('username').value==""){
					document.getElementById('username').value="username";
				}
			}
			
			
			document.getElementById('pass').onfocus=function(){
				document.getElementById('pass').value="";
			}
			document.getElementById('pass').onblur=function(){
				if(document.getElementById('pass').value==""){
					document.getElementById('pass').value="password";
				}
			}
			
			document.getElementById('keyword').onfocus=function(){
				document.getElementById('keyword').value="";
			}
			document.getElementById('keyword').onblur=function(){
				if(document.getElementById('keyword').value==""){
					document.getElementById('keyword').value="search....";
				}
			}
		}