How do I get a URL to launch in a new window and also how do I get a button to open a javascript pop-up window like:

window.open('http://www.somewebsite.com','Website','width=600,height=4 00,resizable=no,scrollbars=yes,menu=no,toolbar=no, status=no,location=no,top='+((screen.availHeight/2)-(400/2 ))+',left='+((screen.availWidth/2)-(600/2 ))+'')


Thanks,
MGF