[jQuery] Image Button Acts Like "Submit" Button for JQuery Call

[rcflyer2005]

On my web page, I have two image button to dynamically add or delete a
row of data in a table.  When I click the buttons, they submit the
form and execute the action="justDoIt.php"  on the <form> tag and not
call jquery.  Is there any way this can be fixed.  I'm using IE6 & 8
beta.  I have to stick with IE for now because I have vbs.

Thanks loads!
Marv.

These two buttons work, but are very ugly:

 <input type="button" value="del" class="delrow"/> -->
 <input type="button" value="add" class="addrow" id="addrow"/>


I would like to get these two buttons to work:
<div><td>
        <input type="image"  class="delrow" src="images/rowOutDel.png"
          onmouseout= this.src="images/rowOutDel.png"
          onmouseover=this.src="images/rowOverDel.png"
          onmousedown=this.src="images/rowDownDel.png"  />

    <input type="image"  class="addrow" src="images/rowOutAdd.png"
                  onmouseout= this.src="images/rowOutAdd.png"
                  onmouseover=this.src="images/rowOverAdd.png"
                  onmousedown=this.src="images/rowDownAdd.png" />

 </td></div>