function clearItem(obj, value) {
	if (obj.value==value) {
		 obj.value='';
	 };

}

function fillItem(obj, value) {
	 if (obj.value=='') {
		 obj.value=value;
	 };
}

function swapImage(obj, src) {
	 //eval(obj.src= "images/"+src);
	 obj.src = src;
}