function displaylayer(layers,current,last){
    currentlayer = document.getElementById(layers+current);
    if(currentlayer.style.display == 'none') {
        for(i=1;i<=last;i++){
            document.getElementById(layers+i).style.display = 'none';
        }
        $(currentlayer).fadeIn(500);
    }
    else {
        $(currentlayer).fadeOut(500);
    }
        $(currentlayer).fadeIn(500);
}