function class_loadbar(){

    var loader=null;
    
    this.init=function(resource){
        
        var my_img=new Image();
        
        my_img.src=resource;
        my_img.className="loadbar_img";
        
       
        
        loader=document.createElement('div');
        loader.className="loadbar";
        loader.id="loadbar";         
        
        loader.style.top=(window.container_height/2)-14+"px";
        loader.style.left=(window.container_width/2)-75+"px";  
        
        
        loader.appendChild(my_img);

        
    }
    
    this.show_loader=function(){
        
        

        if(document.getElementById('loadbar')){
            loader.style.display="block";
        }
        else{
            loader.style.display="block";
            document.getElementById('karte').appendChild(loader);
        }
        
    }
    
    this.hide_loader=function(){
        loader.style.display="none";
        //document.getElementById('karte').removeChild(loader);
    }


}