if (document.images) {
img1N= new Image(40,24);
img1N.src= 'arrow1.gif' ;
img1H= new Image(40,24);
img1H.src= 'arrow2.gif' ;
function myOn(myImgName) {
document[myImgName].src=eval(myImgName+ 'H' ).src;
}
function myOut(myImgName) {
document[myImgName].src=eval(myImgName+ 'N' ).src;
}
}