Java script not working

<td height="20" class="submenu2"> 
                                    <div align="left"><u><a href="javascript:;" class="submenu2" onClick="MM_openBrWindow('/small_window.htm','','scrollbars=yes,resizable=yes,width=350,height=450')"><u>previous 

that’s my code… i have a link someone did for me and it’s weird cause it wont work any way u try to do it! ive deleted the above code but nope no luck!!!..

it’s supposed to be a link that has a pop up box come up upon clicking…but all i get now is error blah blah baa!!!