Cambiare due frame con un solo click

[epescol]

<script language="JavaScript" type="text/JavaScript">
function jump_frames(URL1, URL2, URL3)
{
parent.frames[0].location.href=URL1+'.htm';
parent.frames[1].location.href=URL2+'.htm';
parent.frames[2].location.href=URL3+'.htm'
}
</script>


<a href="javascript:jump_frames('frame1','frame2','fr ame3')"</a>