Recombinant Distance Calulcator

HTML

<h1>Recombinant Distance Calculator</h1><br/>
Recombinant distance is a fundamental principle of Genetics and information about it and information on how these calculations work is available at <a href="http://en.wikipedia.org/wiki/Genetic_linkage" target="_new">Wikipedia</a><br/><br/>
Calculates Relative Allele Distances<br/><br/>

Input <b>ABC</b>/abc population <input type="text" id="a1" size="5" /><br/>
Input abc/abc population <input type="text" id="a2" size="5" /><br/>
Input <b>AB</b>c/abc population <input type="text" id="a3" size="5" /><br/>
Input a<b>B</b>c/abc population <input type="text" id="a4" size="5" /><br/>
Input <b>A</b>bc/abc population <input type="text" id="a5" size="5" /><br/>
Input a<b>BC</b>/abc population <input type="text" id="a6" size="5" /><br/>
Input ab<b>C</b>/abc population <input type="text" id="a7" size="5" /><br/>
Input <b>A</b>b<b>C</b>/abc population <input type="text" id="a8" size="5" /><br/>
<p id="tot"> </p>
   <br/><br/>
    
<input type="button" value="Calculate" id="calculate" />
<br/><br/>
<p id="output"> </p>    
<p> id
 
</p>

CSS

INput var
Input var
 2
 Input var 3

JavaScript

function calculate() {
    
    var va1 = Number($('#a1').val());
    var va2 = Number($('#a2').val());
    var va3 = Number($('#a3').val());
    var va4 = Number($('#a4').val());
    var va5 = Number($('#a5').val());
    var va6 = Number($('#a6').val());
    var va7 = Number($('#a7').val());
    var va8 = Number($('#a8').val());
    
    var total = va1+va2+va3+va4+va5+va6+va7+va8;
    tot.innerHTML = "Total: " + total;
    
    var ap1 = va1/total;
    var ap2 = va2/total;
    var ap3 = va3/total;
    var ap4 = va4/total;
    var ap5 = va5/total;
    var ap6 = va6/total;
    var ap7 = va7/total;
    var ap8 = va8/total;
    
    var ab = va4 + va5 + va6 + va8;
    var ac = va3 + va5 + va6 + va7;
    var bc = va3 + va4 + va7 + va8;
    
    var s = "";
    
    s += "A to B distance: " + 100*ab/total + " cM <br/>";      
    s += "A to C distance: " + 100*ac/total + " cM <br/>";      
    s += "B to C distance: " + 100*bc/total + " cM <br/>";  

    output.innerHTML = s;
}

$('#calculate').click( function() {
     calculate();  
});