function change_ch(Image) {
		Image.src=Image.src.substring(0,Image.src.length-4)+"_ch"+Image.src.substring(Image.src.length-4,Image.src.length);
	 
	}
	
	
function change(Image) {
		Image.src=Image.src.substring(0,Image.src.length-7)+Image.src.substring(Image.src.length-4,Image.src.length);
	}