After logging in successfully, the number of seconds will be automatically calculated and the jump will be performed.

<script language = "javascript" type = "text/javascript">
function $(id){
return (id);
}

function checkUser(){
if($("u1").value == "hello" && $("p1").value == "123"){
return true;
}else{
return false;
}
}
</script>
<form action = "">
<div style = "width:300px;height:200px;border:1px solid red;background-color:pink">
<p/>
U:<input id = "u1" type = "text" value = "" /> <br><br>
P:<input id = "p1" type = "text" value = "" /> <br><br>
<input type = "submit" onclick = "return checkUser()" value = "Login" style = "margin-left:20px"/>
</div>
</form>