convert ASP Java script to php JS

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Javascript

Hello ALL
i have this script its work good in asp but i try the same example in php but its not work whats the problem .. plz help

<script type="text/javascript">

       function Calculate() {
           var Txt_Percent = document.getElementById('<%= txt_Percent.ClientID %>');
           var Txt_Fix = document.getElementById('<%= txt_Fix.ClientID %>');
           if (document.getElementById('<%= rad_Fix.ClientID %>').checked == true) {
               document.getElementById('txt_Percent').disabled = true;

               var lblReadCost = document.getElementById('<%= lbl_Read_Cost.ClientID %>');

               var lblReadCostValue;
               var Lab_Read_Net = document.getElementById('<%= lbl_Read_Net.ClientID %>');
               var hf_Read_Net = document.getElementById('<%= hf_Read_Net.ClientID %>');


               if (navigator.appName == 'Netscape')
                   lblReadCostValue = lblReadCost.textContent;
               else
                   lblReadCostValue = lblReadCost.innerText;





               if (navigator.appName == 'Netscape')
                   Lab_Read_Net.textContent = (eval(lblReadCostValue) - eval(Txt_Fix.value));
               else
                   Lab_Read_Net.innerText = (eval(lblReadCostValue) - eval(Txt_Fix.value));

               hf_Read_Net.value = (eval(lblReadCostValue) - eval(Txt_Fix.value));

               if (document.getElementById('<%= txt_Fix.ClientID %>').value == '') {
                   Lab_Read_Net.innerText = (eval(lblReadCostValue));
               }



           }

           if (document.getElementById('<%= rad_Percent.ClientID %>').checked == false) {

               Txt_Percent.value = "";
           }


       }
     
    </script>

    <script type="text/ecmascript">

        function Calculate1() {


            var Txt_Fix = document.getElementById('<%= txt_Fix.ClientID %>');
            var Txt_Percent = document.getElementById('<%= txt_Percent.ClientID %>');

            if (document.getElementById('<%= rad_Percent.ClientID %>').checked == true) {
                document.getElementById('txt_Fix').disabled = true;

                var lblReadCost1 = document.getElementById('<%= lbl_Read_Cost.ClientID %>');
                var lblReadCostValue1;

                var Lab_Read_Net = document.getElementById('<%= lbl_Read_Net.ClientID %>');
                var hf_Read_Net = document.getElementById('<%= hf_Read_Net.ClientID %>');


                if (navigator.appName == 'Netscape')
                    lblReadCostValue1 = lblReadCost1.textContent;
                else
                    lblReadCostValue1 = lblReadCost1.innerText;


                if (navigator.appName == 'Netscape')
                    Lab_Read_Net.textContent = (eval(lblReadCostValue1) - eval(Txt_Percent.value));




                var x = (eval(lblReadCostValue1) * eval(Txt_Percent.value) / 100);

                Lab_Read_Net.innerText = (eval(lblReadCostValue1) - parseInt(x));


                hf_Read_Net.value = (eval(lblReadCostValue1) - parseInt(x));

                if (document.getElementById('<%= txt_Percent.ClientID %>').value == '') {
                    Lab_Read_Net.innerText = (eval(lblReadCostValue1));
                }
            }




            if (document.getElementById('<%= rad_Fix.ClientID %>').checked == false) {

                Txt_Fix.value = "";
            }



        }
    </script>