//判断用户的输入是否合法
function check(){
	if (myform.Username.value==""){
	alert("请输入用户名！");myform.Username.focus();return;
	}
	if (myform.Truename.value==""){
		alert("请输入真实姓名！");myform.Truename.focus();return;
	}
	if (myform.Pas1.value==""){
		alert("请输入密码！");myform.Pas1.focus();return;
	}
	if (myform.Pas1.value.length<6){
		alert("密码至少为6位，请重新输入！");myform.Pas1.focus();return;
	}		
	if (myform.Pas2.value==""){
		alert("请确认密码！");myform.Pas2.focus();return;
	}
	if (myform.Pas1.value!=myform.Pas2.value){
		alert("您两次输入的密码不一致，请重新输入！");myform.Pas1.focus();return;
	}

	
	myform.submit();		
}