function check()
{
if(document.forms[0].profit.value=="")
{
alert("This value is Required!");
document.forms[0].profit.focus();
return false;
}

if(isNaN(document.forms[0].profit.value)) {
	alert("Only Numeric value allowed!");
	document.forms[0].profit.focus();
	return false;
}

if(document.forms[0].convert.value=="")
{
alert("This value is Required!");
document.forms[0].convert.focus();
return false;
}
if(isNaN(document.forms[0].convert.value)) {
	alert("Only Numeric value allowed!");
	document.forms[0].convert.focus();
	return false;
}
document.forms[0].perday.value=(document.forms[0].profit.value) * (document.forms[0].convert.value) ;
document.forms[0].days.value=(document.forms[0].perday.value) * 22;
document.forms[0].months.value=(document.forms[0].days.value) * 12;
return false;
}