<a href="facebook.com/sharer" target="_blank" >Share this</a>
How do I make this a certain width and height, in a new window, when the user clicks on it? In firefox, the current code only opens up a new tab (not a new window)
To open in a new windows with dimensions and everything, you will need to call a JavaScript function, as target="_blank" won't let you adjust sizes. An example would be:
<a href="http://www.facebook.com/sharer" onclick="window.open(this.href, 'mywin',
'left=20,top=20,width=500,height=500,toolbar=1,resizable=0'); return false;" >Share this</a>
Hope this helps you.