completely smashes the search page

Module search in firefox browser completely smashes the search page in IE is ok. How to fix it?

Can you give us link to your site?

www.szansadladopiewa.pl
give me your email address I will send you user and pass

Just use "Report To Moderator" option to send us pass

You did some customization to layout like

.mp_advert3 {
background: url(../images/custom/newsletter_bg.png) no-repeat top left;
width: 378px;
min-height: 200px;
margin-top: 230px;
}

the site is general mess and it is caused by them.

ok if it is spoiled myself sorry. I please write me in which file are these bad changes. I understand that if there pasting the corresponding original piece of code that everything will be ok?