function set_image_src(id,source){document.getElementById(id).src=source;}
	
function O(){}

function wechsel(a)
{
	if(a==0){set_image_src("wohin","/seiten/layout/images/w_leer.gif");set_image_src("zurueck","/seiten/layout/images/zurueck.gif");set_image_src("vor","/seiten/layout/images/vor.gif");}
	if(a==1){set_image_src("wohin","/seiten/layout/images/w_zurueck.gif");set_image_src("zurueck","/seiten/layout/images/zurueck_over.gif");}
	if(a==2){set_image_src("wohin","/seiten/layout/images/w_vor.gif");set_image_src("vor","/seiten/layout/images/vor_over.gif");}
}