// Global Rollovers

function imgOn(imgName) { 
     if (document.images) { 
     document[imgName].src = eval(imgName + "_on.src"); 
     } 
} 

function imgOff(imgName) { 
     if (document.images) { 
     document[imgName].src = eval(imgName + "_off.src"); 
     } 
}