js popup not working on many other machines w/ js enabled ?

[programguru]

below is the script have been successfully using for several years to popup new pages. i have a client who is claiming he is only getting 404 errors w/ the page redirecting to: www.TheDomainTheScriptIsOn.com/home.asp as a 404

 

function popitup(url) {
newwindow=window.open(url,'name','height=900, width=950,resizable=1,scrollbars=1,toolbar=0,');
if (window.focus) {newwindow.focus()}
return false;
}

 

<a href="http://clients.mindbodyonline.com/ws.asp?studioid=2158" onClick="return popitup('http://clients.mindbodyonline.com/ws.asp?studioid=2158')">link
</a>

 

here are some steps i have taken to test with not resolution:

-- cleared cache

-- double checked url paths

-- attempted with http://www. and w/out the www.

-- javascript is enabled

 

does anyone know if js can be regulated at an ISP level?

 

SOS