function toggle_offer(view, aTag){
    var content = document.getElementById("offer_" + view);
    var title = document.getElementById("title_" + view);
    if(content.className =="hidden"){
        content.className =""
        title.innerHTML = "- "+ title.innerHTML.substring(1);
        
    }else if(content.className ==""){
        content.className = "hidden";
        title.innerHTML = "+ "+ title.innerHTML.substring(1);
    }

}