function ch(){
	var x,val,a=ch.arguments;
	x=document.images[a[0]];
	path=a[a.length-1];
	fullpath=x.src;
	arrpath=fullpath.split('/');
	val=arrpath[arrpath.length-1];
	if ( val!=a[2]){
		x.src=path+a[1];
	}
}