Try with an iframe and a bit of javascript. Here is the main script
PHP Code:
//js functions
<script>
function call_iframe()
{
document.getElementById("iframe_id").src="script2.php?param1=val1¶m2=val1" //etc
}
</script>
<iframe name="iframe_name" id="iframe_id" src=""></iframe>
script2.php
PHP Code:
<?
echo($_GET["param1"]);
?>
Of course you can also employ some ajax tricks but this also seems to do the job