need help

[urstorm.com]

i have 2 problems in my forums : and i hope get some help . and pls try understand my bad english :
1- ppl after registered in my forums , and done . try to loging, its say ok and u loged , but when he in the maine page its appere not logine!
2- using internet explorer we got a problem : this pic may help explan





i can insert this code in the header - but i thing its not gona solve the maine problem . true ?

PHP Code:

 <script language="JavaScript">
<!--
function stopError() {
return true;
}
window.onerror = stopError;
// -->
</script>