Wuz up,

This is the website issue I am now having problem with when doing it in php.....The webpage is @
http://www.vicomputerguy.com/steel/dsheet2.htm     the php code is below......the problem I'm having is that I dont know how to keep a running total while I'm entering infomation,and also to prevent entry of Alpha-numeric characters in each field.


right:.5pt solid black'>Light (60
  watts)</td>
  <td class=xl41 align=right>60</td>
  <td class=xl41 align=right>60</td>
  <td class=xl42><input type="Text" name= $light size="7" align=right value=0></td>
  <td class=xl43 align=right><?php $lightw = $light * 60?>0</td>
  <td class=xl42><input type="Text" name="lightq" size="7" align=right value=0>&nbsp;</td>
  <td class=xl44 align=right>0</td>
  <td class=xl26>&nbsp;</td>
 </tr>
 <tr height=12>
  <td height=12></td>
  <td class=xl25>&nbsp;</td>
  <td class=xl45>2</td>
  <td colspan=3 class=xl96 style='border-

Thank you!