var page = {
  eml : null,
  submenu : null,
  hide : true,
  
  onload : function() {
    page.eml = document.getElementById('email');
    if (page.eml == null) return;
    page.eml.onclick = page.onclick;
    document.getElementById('submit1').onclick = page.onsubmit;
    document.getElementById('submit2').onclick = page.onsubmit;
  },
  
  onclick : function() {
    this.value = '@';
  },
  
  onsubmit : function() {
    if (page.eml.value == "") {
		  alert("Musíte zadat email!");
		  page.eml.focus();
		  return false;
    }
    if (!window.RegExp) return true;
		re = new RegExp("^[^@]+@[^.]+\..+$");
		if (re.test(page.eml.value)) return true;
		alert("Zadaný email není platný!");
  	page.eml.focus();
	  return false;
	}  
}
window.onload = page.onload;