// EMI Calculator
function calculate_emi (form) {
    var str = form.amount.value;
    for (var i = 0; i < str.length; i++) {
         var ch = str.substring(i, i + 1)
         if ((ch < "0" || "9" < ch) && ch != '.') {
               //document.alert ("Please enter only digits");
			   form.perannum.value="Please enter only digits"; 
               return  false;  
         }
    }  
    var loan = eval(form.amount.value);
    loan *= 100000;
     
    var term = eval(form.year.value);

    var annum = eval(form.intrest.value);  
    annum = annum / 100;

    var an_exp = Math.pow((1 + annum), term);
    
    var result = ((loan * annum * an_exp) / (12 * (an_exp -1)));
    var fina = Math.round(result);
    form.result.value = fina;
    return true;
}