[mbozick1]

Probaj ovako.

head:

<script type="text/javascript">
function calc1(form) {
a = form.a.value*form.b.value;
c=form.c.value*form.b.value;
u=a-c;
form.total3.value = u;
}
</script>

<style type="text/css">
button {padding:0;}
</style>

body:

<form name="form1">
<table border=0 cellpadding=4 cellspacing=1>
<tr>
<td width="310" height="219" align=center><p>
    <input type="text" name="a" size=5>
  </p>
  <p>
       
    <input type="text" name="b" size=5>
    </p>
  <p>
    <input type="text" name="c" size=5>
  </p>

  <p><button type="button" onclick="javascript:calc1(this.form)">
<img src="button.gif">
</button> </div>

    </p>
  <p>
  <input type="text" name="total3"
size=5 maxlength=40 />
  kn</p></td>
</tr>
</table>