function toggle(obj) {

var _arrow = document.getElementById(obj);
var arrow= _arrow.src;
var _path=arrow.split('/');
var image=_path[_path.length-1];
var path="";
for (i=0;i<_path.length-1;i++){
path+=_path[i]+'/';
}




if (image=='bluearrow-right.jpg'){

//set arrow to down
_arrow.src=path+'bluearrow-down.jpg';

}else{
//set arrow to right
_arrow.src=path+'bluearrow-right.jpg';


}

return false;
}