function checksearchform()
{ var keyword = document.getElementById("keyword").value; 
if (keyword.length<3) 
{ alert('请填写关键词!且不少于两个字');	
 document.getElementById("keyword").focus(); return false; } 
return true; }

function checkloginform()
{ var username = document.getElementById("username").value; 
var password=document.getElementById("psw").value; 
var verifycode = document.getElementById("vdcode").value; 
if (username.length<2) 
{ alert('请填写用户名!');	
 document.getElementById("username").focus(); return false; } 
if (password.length<2)
{ alert('请填写密码!'); document.getElementById("psw").focus(); return false; }
if (verifycode.length<2)
{ alert('请填写验证码!'); document.getElementById("vdcode").focus(); return false; } 
return true; }

function checkLogin(n) {
	var keyword = document.getElementById("keyword")
	if (n == 0 && keyword.value == "请输入查找的关键词"){keyword.value="";keyword.style.cssText = "color:#000"}
	if (n == 1 && keyword.value == ""){keyword.value = "请输入查找的关键词";keyword.style.cssText = "color:#aaa"}
}