window.galBlock==false;
	function chimg(img,itemnum){ 
	  /** 
	   if(window.galBlock==false){return;}
	   window.galBlock=true;
	   
	   opTween = new OpacityTween(document.getElementById("big_img"),Tween.regularEaseOut, 100, 0, 0.5);
       opTween.onMotionFinished = function (){
       
           newImage = "url(" + img + ")"; 
           document.getElementById("big_img").style.backgroundImage = newImage;	   
           for(i=0;i<window.galeryItemsNum;i++){
               thumb = document.getElementById("thumb_img" + i).style;
               if(i==itemnum){
                  thumb.display="none";
               }else{
                  thumb.display="inline";
               }                 
           }
           opTween2 = new OpacityTween(document.getElementById("big_img"),Tween.regularEaseOut, 0, 100, 0.5);
           opTween2.onMotionFinished = function (){
                window.galBlock=false;
           }
           opTween2.start();
       
       
       }
       opTween.start();
	   
	   /**/
	   newImage = "url(" + img + ")"; 
	   document.getElementById("big_img").style.backgroundImage = newImage;	   
	   for(i=0;i<window.galeryItemsNum;i++){
    	   thumb = document.getElementById("thumb_img" + i).style;
	       if(i==itemnum){
	          thumb.display="none";
	       }else{
	          thumb.display="inline";
	       }

	   }
	   /**/
	}