<?php if(isset($_POST['submit'])) { $sale_price = $_POST['sale_price']; // posted value $title_insurance = ($sale_price * 0.00575) + 200; ?> <script type="text/javascript"> document.getElementById("title_insurance ").value='<?php echo $title_insurance ; ?>'; </script> <?php } <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data"> <input name="sale_price" type="text" id="sale_price" size="15"> <input name="title_insurance" type="text" id="title_insurance" size="15" value="<?php echo $title_insurance; ?>" /> <input name="button" type="submit" class="bordered" id="button" value="Calculate" /> </form>
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