Need Help: Javascript loading issue

Hi Guys, I am facing a really odd issue here: my scripe will only work if I put a alert() at the end of the function.???
OK Here is the story:

As you can see the blowing code, it will only work if I put a line:” [COLOR=”Red”]alert(“thank”); [/COLOR]” otherwise, the function foodo (url) seems never been call, or say there is no text field been created.

Any idea why?

index page:

[code=html]
// I include a js file to index page:
<script type=”text/javascript” src=”https://xxx.com/my.js”></script>
[/code]

my.js

[code=html]
function foodo (url) {

// Create new JS element
var jsel = document.createElement(‘SCRIPT’);
jsel.type = ‘text/javascript’;
jsel.src = url;
document.body.appendChild (jsel);

return true;
}

function Caller(formID){

var elem = document.getElementById(formID).elements;
var str = ”;

for(var i = 0; i < elem.length; i++)
{
str += “&”+elem[i].name + “=”+elem[i].value;
}

foodo (‘http://xxx.com/createText.php?param=0’+ str);

alert(“thank”);
}

[/code]

createText.php page:

[code=php]

// Process passing values and creat a text file. This isn’t a big file.

[/code]

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