Sorry if I confused you... No matter what, you need to use Javascript. The difference being... In the link I provided, you'd have a script block in your header so you could have a reusable widget for multiple buttons...
You could inline it and skip the script block by doing something like this:
<input type="button" value="Sumit" onClick="javascript:void(window.open('yourpage.php', 'WindowName', 'toolbar=no,location=no, directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=400,height=400,top=10,left=10'))">
This would open a window called WindowName and have the file yourpage.php in it. It would be 400x400 and be 10 pixels from the left and top.
Keep in mind, if you do it this way, you would need to define everything for each button, individually.