Calling Java Script Function Into smarty tpl

<script type="text/javascript">
 {literal}
        function emi()
        {
                var P = $smarty.capture.$clean_price; // pick the form input value..
                var rate = 14; // pick the form input value..
                var n = 12; // pick the form input value..
                var r = rate/(12*100); // to calculate rate percentage..
                var prate = (P * r * Math.pow((1+r),n))/(Math.pow((1+r),n)-1); // to calculate compound interest..
                var emi = Math.ceil(prate * 100) / 100; // to parse emi amount..
        // to assign value in field1 as fixed upto two decimal..
                var finalemi= emi.toFixed();
                
        //to assign value in field2..   
                var tot = Math.round(document.formval.field1.value * n * 100)/100; // to calculate total amount
                document.formval.field2.value = Math.abs(tot);
        // to assign value in field3..  
                var int_amt = document.formval.field2.value - P; // to calculate net interest amount
                document.formval.field3.value =  int_amt.toFixed(2);
        } 
         
         {/literal}
        </script> 
             <a href="javascript:void();" onclick="javascript:emi()" title="Emi From"></a>

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