function swap(target, state){
	var url = target.src;
	var arr = url.split("/");
	var filename = arr.pop();
	var loc = arr.join("/")+"/";
	filename = filename.split("_over").join("");
	switch(state){
		case 'over':
			filename = filename.split(".").join("_over.");
			
			target.src = loc+filename;
		break;
		case 'out':
			target.src = loc+filename;
		break;
	}
}