Just to expand on what Bifta has said.
Code:
<a href="http://www.yoururl.co.uk/contactus/contact-form.php"
target="_blank"
onMouseDown="MM_openBrWindow('http://www.yoururl.co.uk/contactus/contact-
form.php','Contact','scrollbars=yes,width=650,height=610')">Contact</a>
Or
Code:
<a href="#"><img src="images/Door/black1.jpg" width="102" height="90" border="0"
onMouseDown="MM_openBrWindow('imagehtm/blackhandles.htm','black','scrollbars=yes,width=80,
height=90')"></a>
Hope this helps