// JavaScript Document
function changeImages() {
    if (document.images) {
        for (var i=0; i<changeImages.arguments.length; i+=2) {
            document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
        }
    }
}

function clearField(fieldObject, msg)
{
 if(fieldObject.value == msg) fieldObject.value = '';
}