function area(){
var width = document.geo.width.value;
var height = document.geo.height.value;
var area = (width*height);
var total = area / 25;
document.geo.amount.value = total;
}
document.write('<table align="center" class="table01">');				
document.write('<tr><td>How much Geo Textile do you need?<br> Enter the size of pondliner you purchased.  This tool will show you the total number of underlayment you need for your project.</td></tr>');
document.write('<tr><td><form name="geo"></td></tr>');	
document.write('<tr><td align="center"><input type="text" name="width" size="3"> Ft. X <input type="text" name="height" size="3"> Ft. = <input type="text" name="amount" size="3"> Quantity</td></tr>');	
document.write('<tr><td align="center"><input type="button" name="go" value="Calculate" onClick="area();">&nbsp;&nbsp;<input type="reset" value="Clear"></td></tr>');	
document.write('<tr><td></form></td></tr>');	
document.write('</table>');