Edit: Here's a JSfiddle

Edit2: The error is on this line: <input type=button value=totalbandwidthresult onclick=javascript:totalbandwidth();>

Trying to have a button perform a calculation. The required variables are below, as well as the HTML where

I am getting an error onclick: Uncaught TypeError: object is not a function index.html:71
onclick

Here is my Javascript

function totalbandwidth() {  

    var fps=Number(document.calculator.fps.value);  

    var bitrate=Number(document.calculator.bitrate.value);  

    var numberofcameras = Number(document.calculator.numberofcameras.value); 

    var encoding = document.calculator.encoding.value; 

    if (encoding = mjpeg)

    {

        storage = bitrate*fps;

    }

    else

    {

        storage = bitrate;

    }



    totalbandwidth = (numberofcameras * storage) / 1000;

    document.calculator.totalbandwidthresult.value = totalbandwidth;  

}  

The HTML:

<form name=calculator class=formtable>  

<div class=formrow><label for=rcname>RC Name</label> <input type=text name=rcname></div>  

<div class=formrow><label for=fps>FPS</label> <input type=text name=fps>  </div>  

<div class=formrow><label for=bitrate>Bitrate</label> <input type=text name=bitrate>  </div>  

<div class=formrow><label for=numberofcameras>Number of Cameras</label> <input type=text name=numberofcameras> </div>   

<div class=formrow><label for=encoding>Encoding</label> <select name=encoding id=encodingoptions>

  <option value=h264>H.264</option>

  <option value=mjpeg>MJPEG</option>

  <option value=mpeg4>MPEG4</option>

</select></div>  

Total Storage: <input type=text name=totalstorage>   

Total Bandwidth: <input type=text name=totalbandwidth>   

<input type=button value=totalbandwidthresult onclick=javascript:totalbandwidth();>  

Basically - it seems that there may be something wrong with the syntax I used in the JS - but I'm not sure.