input values to 2D array and get back using two for loops in Javascript

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How to input values to 2D array using two for loops and get back using same way.. (I am going to code a simulator for matrices addition)...

I made matrices by using tables and text-boxes
this is my code:

declaration:

var matA = new Array(2);
var matB = new Array(2);
var matAns = new Array(2);

for(i=0; i<2; i++)
{
    matA[i] = new Array(2);
    matB[i] = new Array(2);
    matAns[i] = new Array(2);
}

Code (Input Data form :

function getValueFromMatA()
{
   for(r=0; r<2; r++)
   {
        for(c=0; c<2; c++)
        {
              matA[r,c]=parseInt(document.getElementById('nodeA'+r+''+c).value);
              //getting values from each text-box in matrix(table)
        }
   }
}

function getValueFromMatB()
{
    for(r=0; r<2; r++)
    {
        for(c=0; c<2; c++)
        {
              matB[r,c]=parseInt(document.getElementById('nodeB'+r+''+c).value);
              //getting values from each text-box in matrix(table)
        }
    }
}

Code: Output(In this i can't get matAns[0,0] value and matAns[0,1] value. it gives me always matAns[1,0] value and matAns[1,1]

function addMaAMatB()
{
   for(r=0; r<2; r++)
   {
       for(c=0; c<2; c++)
       {
            matAns[r,c] = matA[r,c]+matB[r,c];
       }
   }
}
function printMatAns()
{
    for(r=0; r<2; r++)
    {
        for(c=0; c<2; c++)
        {
            alert(matAns[r,c]);
        }
    }
}

Please help me... where am I wrong??