Secondo voi perchè non mi si apre questa popup?

codice:
<td width="23%" bordercolor="#000000" height="32" style="border: 1 solid #FFFFFF"><font color="#2F4F4F"><span style="background-color: #000000"><INPUT id=button7 name=button2 onclick=window.open window.open('stampamed.asp','width=200, height=200, resizable, scrollbars=1, top=50, left=50') type=button value=stampa></span></font></td>