//check if browser is capable, NS3+, IE4+ 

if (document.images) { 

//preload images 

//base image 

img1N= new Image(189,17); 

img1N.src= 'images/fitness-addy.gif' ; 

//hover or rollover image 

img1H= new Image(189,17); 

img1H.src= 'images/fitness-addyhover.gif' ; 

function myOn(myImgName) { 

//we need to name the image in the BODY 

//so we can use its name here 

document[myImgName].src=eval(myImgName+ 'H' ).src; 

} 

function myOut(myImgName) { 

document[myImgName].src=eval(myImgName+ 'N' ).src; 

} 

} //end of if document.images