var myFocus = new Array("0", "0");

function checkForm(theForm) 
{
    var why = "";
    var uin = theForm.uin.value;
    var pac = theForm.pac.value;
    
    why += checkUIN(uin);
    why += checkPAC(pac);
   
    if (why != "") 
	{
        alert(why);
        for (k=0; k < myFocus.length; k++)
        {
            if (myFocus[k] == "1")
            {
                theForm.elements[k].focus();
                myFocus = new Array("0", "0");
                break;
            }
        }
        return false;
    }

}

function checkUIN (strng) 
{
    var error="";
    if (strng == "") 
    {
        error = "You didn't enter an SFSU ID.\n";
        myFocus[0] = "1";
    } else {
		var uinFilter=/^[0-9]{9}$/;
  		if (!(uinFilter.test(strng))) 
    	{ 
       		error = "Please enter a valid SFSU ID.\n";
       		myFocus[0] = "1";
    	}
    }
    
    return error;    
}

function checkPAC (strng) 
{
    var error = "";
    if (strng == "") 
    {
        error = "You didn't enter a PAC.\n";
        myFocus[1] = "1";
    }
    
    return error;    
}