Hello

I need help with this code. I am beginner.

My platform PHP, MySQL. I am not very familiar with Javascript.

I need to calculate value of each Checkbox List (Price) plus value from one TextBox (PrixBase)

I have found this JQuery which works great in my case, but it make append two numbers instead calcul addition

1. <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script> 
    <script language="JavaScript" type="text/javascript"> 
    <!--//--><![CDATA[//> 
   <!-- $(document).ready( function() { 
   $(".chkOptions").click( 
   function () { 
   var ntot = document.getElementById('PrixBase').value; $(".chkOptions:checked").each(function () { 
   ntot += parseInt($(this).val()); 
   }); 
   $("#txtTotalOptions").val(ntot); 
    }) 
   .change(); 
    
    }); 
    //--><!]]> </script>
   
   
   
   
   
   
   
   
   
   
   
   
   
   

This code works very well, it makes sum of each checkbox with class="checkbox", but only if i put value ntot = 0. I want to assign certain value to ntot from one textbox.

Can you help me to modify this code to make sum (all checkboxes + one textbox)

Example page at Options calculation

Thank you very much