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Run script onload and onchange?

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I have the following script for onchange...  I would like run it onload also, is there a easy way to do it?




 function calculate()
var current = parseFloat(document.getElementById("cbParamVirtual1").value);
if (isNaN(current)) current = 0;
var installed ='[@calcfield:2]';
var total_hrs ='[@calcfield:1]';

var currenttotal = parseFloat((current - installed) + parseFloat(total_hrs));

document.getElementById("cbParamVirtual2").value =Math.max(0, currenttotal);




Thanks in advance!

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