function  vcfocus(){

if (document.getElementById("loginName").value != "") {
    document.getElementById('errorInfoln').style.display = "none"; 
	}
	
if (document.getElementById("password").value != ""&& (document.getElementById("password").value.length >=8&&document.getElementById("password").value.length<=15)) {
	document.getElementById('errorInfopw').style.display = "none"; 
	}
	
if (document.getElementById("validateCode").value != "" ) {
	document.getElementById('errorInfovc').style.display = "none"; 
	
	}		

}

function vcblur(id,spanid,n){
      
      name=document.getElementById(id).value;
      var content = ["请输入用户名","请输入密码","请输入验证码"]; 
      if(name==null||name==""){   
      document.getElementById(spanid).innerHTML="<font color='red' style='font-size:12px'>"+content[n]+"</font>";
      return;
      }
		
}