Round sum to 2 decimal places

i've got sum 'shopping cart' style design , want prices round 2 decimal places

i know i've got put math.round... in somewhere, don't know

 

script:

 

<script type="text/javascript"><!--

function updateultra() {

document.form.ultra.value = (document.form.sum1.value -0) * (1.79);  }

//--></script>

<script>

function updateultra() {

    document.form.ultra.value = math.round((document.form.sum1.value -0) * (1.79)); 

}

</script>

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