Calculate 3 variables into html

We have a simple html page and inside it there is a div with an input form. Into input form the user change the number and automatically another 3 vars calculates numbers that are from the first selection of the user. There are 4 forms. First there is the input form. 2ond to 4th form must be the result of the 3 other variables on changing. some code of is that. > <div class="div" id="div"> <script type="text/javascript"> // Calculation function moneyearningscalc(select){ var dmoney = (inputworkinghours * 55 ); var mmoney = (inputworkinghours * 55 * 30 ); var ymoney = (inputworkinghours * 55 * 30 * 12 ); alert ("The selected option is " + [login to view URL]); } </script> text<br> <input name="inputworkinghours" type="number" class="calcfields" id="inputworkinghours" max="24" min="1" step="1" title="WorkingHours" value="0" size="50" maxlength="2" onchange="moneyearningscalc()"><br> <input name="dmoney1" type="number" class="calcfieldsrest" id="dmoney" autocomplete="off" value="0" readonly ><br> <input name="mmoney1" type="number" class="calcfieldsrest" id="mmoney" autocomplete="off" value="0" readonly ><br> <input name="ymoney1" type="number" class="calcfieldsrest" id="ymoney" autocomplete="off" value="0" readonly ><br> </div>