if ( document.images ) {
		
		var image_down_array = new Array();		
		image_down_array["left_arrow_button_top"] = new Image(50, 50);
		image_down_array["right_arrow_button_top"] = new Image(50, 50);		
		image_down_array["left_arrow_button_top"].src = "images/left_arrow_button_down.png";
		image_down_array["right_arrow_button_top"].src = "images/right_arrow_button_down.png";
		image_down_array["zoom_plus_button_top"] = new Image(50, 50);
		image_down_array["zoom_minus_button_top"] = new Image(50, 50);		
		image_down_array["zoom_plus_button_top"].src = "images/zoom_plus_button_down.png";
		image_down_array["zoom_minus_button_top"].src = "images/zoom_minus_button_down.png";

		image_down_array["left_arrow_button_bottom"] = new Image(50, 50);
		image_down_array["right_arrow_button_bottom"] = new Image(50, 50);		
		image_down_array["left_arrow_button_bottom"].src = "images/left_arrow_button_down.png";
		image_down_array["right_arrow_button_bottom"].src = "images/right_arrow_button_down.png";
		image_down_array["zoom_plus_button_bottom"] = new Image(50, 50);
		image_down_array["zoom_minus_button_bottom"] = new Image(50, 50);		
		image_down_array["zoom_plus_button_bottom"].src = "images/zoom_plus_button_down.png";
		image_down_array["zoom_minus_button_bottom"].src = "images/zoom_minus_button_down.png";


		var image_up_array = new Array();		
		image_up_array["left_arrow_button_top"] = new Image(50, 50);
		image_up_array["right_arrow_button_top"] = new Image(50, 50);		
		image_up_array["left_arrow_button_top"].src = "images/left_arrow_button_up.png";
		image_up_array["right_arrow_button_top"].src = "images/right_arrow_button_up.png";
		image_up_array["zoom_plus_button_top"] = new Image(50, 50);
		image_up_array["zoom_minus_button_top"] = new Image(50, 50);		
		image_up_array["zoom_plus_button_top"].src = "images/zoom_plus_button_up.png";
		image_up_array["zoom_minus_button_top"].src = "images/zoom_minus_button_up.png";

		image_up_array["left_arrow_button_bottom"] = new Image(50, 50);
		image_up_array["right_arrow_button_bottom"] = new Image(50, 50);		
		image_up_array["left_arrow_button_bottom"].src = "images/left_arrow_button_up.png";
		image_up_array["right_arrow_button_bottom"].src = "images/right_arrow_button_up.png";
		image_up_array["zoom_plus_button_bottom"] = new Image(50, 50);
		image_up_array["zoom_minus_button_bottom"] = new Image(50, 50);		
		image_up_array["zoom_plus_button_bottom"].src = "images/zoom_plus_button_up.png";
		image_up_array["zoom_minus_button_bottom"].src = "images/zoom_minus_button_up.png";


	}

/* ************************************* */
function ifhover(x,istrue,vImage) {

if (document.images) {
	 if (istrue) {
  	document.images[x.name].src = image_down_array[x.name].src;
  }else{
  	document.images[x.name].src = image_up_array[x.name].src;
  } 
}

}