pgnv = Array(4) ;
pgnv[0]=new Image();pgnv[0].src="works_img/Prev_Off.jpg" ;
pgnv[1]=new Image();pgnv[1].src="works_img/Prev_On.jpg" ;
pgnv[2]=new Image();pgnv[2].src="works_img/Next_Off.jpg" ;
pgnv[3]=new Image();pgnv[3].src="works_img/Next_On.jpg" ;
function SetPgnv(flag,position) { document.images[position].src=pgnv[flag].src }