Nu vet jag inte hur hela ditt formulär ser ut med detta borde fungera:
[FONT=arial][RED][1]<form name="foo">
<input type="text" name="bar1" value="0" onkeyup="this.form.totsum.value=parseFloat(this.form.bar1.value)+parseFloat(this.form.bar2.value)+parseFloat(this.form.bar3.value)+parseFloat(this.form.bar4.value);"><br>
<input type="text" name="bar2" value="0" onkeyup="this.form.totsum.value=parseFloat(this.form.bar1.value)+parseFloat(this.form.bar2.value)+parseFloat(this.form.bar3.value)+parseFloat(this.form.bar4.value);"><br>
<input type="text" name="bar3" value="0" onkeyup="this.form.totsum.value=parseFloat(this.form.bar1.value)+parseFloat(this.form.bar2.value)+parseFloat(this.form.bar3.value)+parseFloat(this.form.bar4.value);"><br>
<input type="text" name="bar4" value="0" onkeyup="this.form.totsum.value=parseFloat(this.form.bar1.value)+parseFloat(this.form.bar2.value)+parseFloat(this.form.bar3.value)+parseFloat(this.form.bar4.value);"><br>
<br>
Totalt: <input type="text" name="totsum" disabled="disabled" value="0" style="border: solid 0px;">
</form>[/1][/RED][/FONT]