String replace_string(String& s1, String& find, String replace){
	String string_result;
	
	int start_pos = 0;
	int found_pos = 0;
	int find_len = find.GetCount();
	int s1_count = s1.GetCount();
	
	while(((found_pos=s1.Find(find, start_pos))!=-1)){
		string_result.Cat(s1.Mid(start_pos, found_pos - start_pos));
		string_result.Cat(replace);
		start_pos = found_pos + find_len;
	};
		
	if(start_pos<s1.GetCount())
		string_result.Cat(s1.Mid(start_pos));
		
	return (string_result);
}