function calculate(total,perc,type)
{
var tot = parseFloat(total);
var per = parseFloat(perc);
var ch= type;

if(ch=='%')
{
document.form_calc.loan_amount.value=tot-((tot*per)/100);
document.getElementById('amountt').innerHTML=document.form_calc.loan_amount.value;

}
else
{
document.form_calc.loan_amount.value=tot-per;
document.getElementById('amountt').innerHTML=document.form_calc.loan_amount.value;

}
}