This JavaScript code will let you define the exact elements of your PopUp window link

Insert this code into your HEAD of HTML

<!-- // == ## This Script Free To Use Providing This Notice Remains ## == // // == This Script Has Been Found In The http://www.DesignerWiz.com Javascript Public Archive Library == // // == NOTICE: Though This Material May Have Been In A Public Depository, Certain Author Copyright Restrictions May Apply == // --><script language="javascript"> var win = null; function NewWindow(mypage,myname,w,h,scroll){ LeftPosition = (screen.width) ? (screen.width-w)/2 : 0; TopPosition = (screen.height) ? (screen.height-h)/2 : 0; settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable' win = window.open(mypage,myname,settings) } </script>

Insert this code into your BODY section

<a href="http://www.your.com" onclick="NewWindow(this.href,'name','620','403','no');return false">ENTER</a>

Simply Cut and Paste Script code
Be sure to properly place script position in head & body sections of html
The script allows for width, height and scroll bar control

This script has been in the DesignerWiz.com Public Library.