Inconsistent response to header()

[ukgeoff]

The following code does different things depending on the browser.

<?php
header ("location: mailto:[e-mail]?subject=Email test");
header ("Refresh: 2; URL=http://1ontheweb.net/index.html");
?>

In Firefox: Email client is activated and browser redirects to page.

In Opera: Email client is activated and browser stays on current page.

In IE: Email client is activated and browser has blank page. Actually it has the php page but of course there is nothing to see.

What do I need to do to get a consistent response?

[mrhappiness]

<?php
header ("location: mailto:[e-mail]?subject=Email test");
?> 
<meta http-equiv="refresh" content="2; URL=http://1ontheweb.net/index.html" />

maybe this works?

but you should provide a clickable link as well

[ukgeoff]

Been down this route. Same responses.