function changePic( x)
{   
	if(!document.getElementById) return false;
	
	if(!document.getElementById("show_win") ) return false;
	
	var elem = document.getElementById("show_win");
	
	if (x==1){
		elem.style.backgroundImage="url(images/camp.jpg)";	
		return true;	
	}
	if (x==2){
		elem.style.backgroundImage="url(images/trailer1.jpg)";
		return true;		
	}
	if (x==3){
		elem.style.backgroundImage="url(images/trailer2.jpg)";
		return true;		
	}
	if (x==4){
		elem.style.backgroundImage="url(images/trailer3.jpg)";		
	}  
	return true; 
}