function newImage(arg) {
 if (document.images) {
  rslt = new Image();
  rslt.src = arg;
  return rslt;
 }
};

function preloadImages() {
 if (document.images) {
  id0_over = newImage("images/mm/home_mm_over.gif");
  id1_over = newImage("images/mm/about_us_mm_over.gif");
  id2_over = newImage("images/mm/news_mm_over.gif");
  id3_over = newImage("images/mm/projects_mm_over.gif");
  id4_over = newImage("images/mm/gallery_mm_over.gif");
  id5_over = newImage("images/mm/faq_mm_over.gif");
  id6_over = newImage("images/mm/contacts_mm_over.gif");
 }
};

function erase (form) {
 for(i = 0; i < form.length; i++) 
  form.elements[i].value = "";
};

function check (form) {
 for (i = 0; i < 7; i++)
  if (form.elements[i].value == "") {
   alert ("Please, fill all required fields");
   return false;
  }
 return true;
};

function check1 (form) {
  if (form.elements[0].value == "" || form.elements[1].value == "" ||
  form.elements[6].value == "" || form.usr_question.value == "") {
   alert ("Please, fill all required fields");
   return false;
  }
 return true;
};