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<script language="javascript">
function calc(){
document.forms[0].sy.value = document.forms[0].kc.value - document.forms[0].xs.value;
}
</script>
<form name="form" method="post" action="">
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</form>
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JScript code:
function calc(){
var n1,n2,n3;
n1=parseInt(document.forms[0].kc.value,10);
n2=parseInt(document.forms[0].xs.value);
n3=n1-n2
if(n3<0) then n3=0;
document.forms[0].sy.value = n3 ;
}
n2=parseInt(document.forms[0].xs.value,10);
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document.forms[0].sy.value = Math.max(document.forms[0].kc.value - document.forms[0].xs.value, 0);
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