form validation javascript isnt working .....

[wxdqz]

...i dont know y . as there seems to be no error ...
hers is the code ...

<title>Login</title>
<SCRIPT LANGUAGE = "JavaScript">

function validate(){

var reg = document.f1.reg_no.value;
var pss = document.f1.pass.value;

if (reg=="")
{
alert('You can't proceed without Registeration number.Please Enter it!);
event.returnValue=false;
}

if (pss=="")
{
alert('You can't proceed without password.Please Enter');
event.returnValue=false;
}

}

</SCRIPT>

.....

<form name="f1" action="ado_st.asp" method=post onSubmit="return validate();" >

......