// PRELOADING IMAGES
if (document.images) {
 img_on =new Image();  img_on.src ="http://www.eolcenter.usf.edu/pictures/Roscoe_conf_planning.jpg"; 
 img_off=new Image();  img_off.src="http://www.eolcenter.usf.edu/pictures/DAUGH&GRAND.png"; 
}

function handleOver() { 
 if (document.images) document.imgName.src=img_on.src;
}

function handleOut() {
 if (document.images) document.imgName.src=img_off.src;
}