function login()
{
	var username_elem = document.getElementById( 'username' );
	var password_elem = document.getElementById( 'userpass' );
    if ( username_elem )
	{
        if ( username_elem.value.length == 0 ) 
        {
           alert("You must enter your Username");
        }
    }

    if ( password_elem )
    {
	    if ( password_elem.value.length == 0 && username_elem.value.length > 0 ) 
        {
           alert("You must enter your Password");
        }
        if ( username_elem.value.length > 0 && password_elem.value.length > 0 )
        {
            var form = document.getElementById( 'login_form' );
            form.submit();
        }
    }

}

function submitenter(myfield,e)
{
	var keycode;
	if (window.event) keycode = window.event.keyCode;
	else if (e) keycode = e.which;
	else return true;

	if (keycode == 13)
	   {
	   login();
	   return false;
	   }
	else
	   return true;
}

function init()
{
	var username_elem = document.getElementById( 'username' );
	var password_elem = document.getElementById( 'userpass' );
    
    username_elem.onkeypress=function(event) { submitenter(this,event); }
    password_elem.onkeypress=function(event) { submitenter(this,event); }
    
}