image01= new Image()
image01.src="images/24hr_defoult.gif"
image02= new Image()
image02.src="images/24hr_onclick.gif"

image03= new Image()
image03.src="images/7days_defoult.gif"
image04= new Image()
image04.src="images/7days_onclick.gif"

image05= new Image()
image05.src="images/most_defoult.gif"
image06= new Image()
image06.src="images/most_onclick.gif"

function rollover(imagename, newsrc){

/*document.images[imagename].src=newsrc.src*/
document.getElementById(imagename).src=newsrc.src;
}