Change onClick='top.location.href="URL"' to Open New Window

How can I change:

onClick='top.location.href="URL"'

to have it open the URL in a new window?

I tried target="_blank" and got an error message:

<table width=500 bgcolor='#000000' cellpadding=2 cellspacing=0 align=center onClick='top.location.href="URL" target="_blank"' onMouseOver='this.style.cursor="pointer"'><tr><td>...

Thanks, Peter

<table width=500 bgcolor="#000000" cellpadding=2 cellspacing=0 align=center onClick="window.open('blah.com')"
onMouseOver='this.style.cursor="pointer"'><tr><td>

<table width=500 bgcolor='#000000' cellpadding=2 cellspacing=0 align=center onClick="window.open('http://url.com','target-name')" onMouseOver='this.style.cursor="pointer"' onMouseOver='this.style.cursor="default"'><tr><td>...

Thanks, worked great.

Peter