javascript prob

Can anybody help me out with this script?
It seems to run as far as checking the first name text box and then it just submits the form even if the text box is blank!

Heres the code:
<SCRIPT language = "Javascript" type="text/javascript">

<!-- hide script from older browsers

function validate() {

//checks MOBILE NO to make sure it has a valid number filled in

if(document.frmRegister1.txtMobileNo.value.length < 10)

{

alert('Please fill in Mobile Phone Number.');

document.frmRegister1.txtMobileNo.focus();

return false;

}



//Makes Sure a password of > 6 characters is entered

if(document.frmRegister1.txtPassword.value == '' || document.frmRegister1.txtPassword.value.length < 6)

{

alert("Please enter a password 6 characters or more in length!");

document.frmRegister1.txtPassword.focus();

return false;

}



//Passwords must be the same

if(document.frmRegister1.txtPassword.value == document.frmRegister1.txtPassword2.value)

{

return true;

}

else

{

alert("Passwords must be the same!");

document.frmRegister1.txtPassword.focus();

return false;

}

//Makes sure a FIRST Name is entered

if(document.frmRegister1.txtFirstName.value == '')

{

alert("Please enter your First Name");

document.frmRegister1.txtFirstName.focus();

return false;

}

//Surname

if(document.frmRegister1.txtSurname.value == "")

{

alert("Please enter your Surname");

document.frmRegister1.txtSurname.focus();

return false;

}



//ok to here!!--------------------

//Ensures Passwords are the same



//Ensures Email Passwords are the same

if(document.frmRegister1.txtEPassword.value == document.frmRegister1.txtEPassword2.value)

{

return true;

}

else

{

alert("Email Passwords must be the same!");

document.frmRegister1.txtEPassword.focus();

return false;

}





//Address1

if(document.frmRegister1.txtAddress1.value == "")

{

alert("Please enter your address");

document.frmRegister1.txtAddress1.focus();

return false;

}



//Address2 confirmation

if(document.frmRegister1.txtAddress2.value == '')

{

if(!confirm("Are you sure you want to leave Address 2 blank?\n Hit 'ok' to continue, or hit 'cancel' to go back and make changes."))

{

document.frmRegister1.txtAddress2.focus();

return false;

}

}

}

//-->

</SCRIPT>

See:

http://forums.aspfree.com/t24150/s.html

Change the point i colored on your code ... to ""
may be it'll do..
//Makes sure a FIRST Name is entered

if(document.frmRegister1.txtFirstName.value == '')

{

alert("Please enter your First Name");

document.frmRegister1.txtFirstName.focus();

return false;

}