function rollover(my_image)
        {
    
            my_image.src = 'images/costAnalysisBtn2.png';
    
        }
function mouseaway(my_image)
        {
    
            my_image.src = "images/costAnalysisBtn1.png";
    
        }
onmouseover="rollover(this)" onmouseout="mouseaway(this)"