php and java script focus()

Hi all.
I try to place focus in a textfield (Sup_no) after the page get an error message. I try coding it in Javascript along in php script.
However, the code below does not function.
I hope anyone here can help me correcting the code below.
Thanks in advance.

PHP Code:

---

    <?php
    $err = $_GET['msg'];
    if ($err=='error'){
        echo "<br>";
        echo "<center><font face=verdana size=2 color=red><b>Supplier No already existed in database, please key in new Supplier No</b><center>";
        echo "<script language='JavaScript'>";
        echo "document.form2.Sup_no.focus()";
        echo "return false";
        echo "</script>";
    }
     ?>

---

Its hard to know whats going wrong without seeing all the code - would you be able to post more of the code (looks like a Javascript problem and not a PHP one).

-- Ryan Jones

You cannot set focus while the document is loading.

I suggest you learn how to write HTML and PHP properly before continuing however becuause that code is terrible.

Have a look at this: http://www.vbforums.com/showpost.php...49&postcount=7

Ok..thank you for the suggestion.
I am just a beginner afterall.
I need idea on how to set focus can be done in php script when the page is loading or is there some other way ?

document.form2 is meaningless.

To do any manipulation of the page you need to use the DOM functions. Any other method is non-standard and not guaranteed to work in more than one particular browser.

Some suggestions: getElementById(), getElementsByTagName().

Look Javascript functions up on MDC for excellent documentation.