function check(a) {
  var ok=true;
  var text="";
  reg=/^[A-Za-z0-9_\-.]+@[A-Za-z0-9_\-.]+.[A-Za-z]{2,5}/i;
  if(a=="login_form"){
	if (document.login_form.password.value == "") {
	  if(!document.login_form.forgot.checked){ok=false; text="Enter 'Password' or mark 'Forgot password'\n"+text; document.login_form.password.focus();}
	}
    if (!reg.test(document.login_form.login.value)) {ok=false; text="'Email'\n"+text; document.login_form.login.focus();} 
  } else {
	if (document.reg_form.password.value == "") {ok=false; text="'Password'\n"+text; document.reg_form.password.focus();}
    if (document.reg_form.password.value!=document.reg_form.password2.value){ok=false; text="Passwords don't match\n"+text; document.reg_form.password.focus();}
    if (!reg.test(document.reg_form.login.value)) {ok=false; text="'Email'\n"+text; document.reg_form.login.focus();}  
	if (document.reg_form.fname.value == "") {ok=false; text="'First Name'\n"+text; document.reg_form.fname.focus();}
	if (document.reg_form.lname.value == "") {ok=false; text="'Last Name'\n"+text; document.reg_form.lname.focus();}
  }
  if(!ok){alert ("Please fill correctly next fields:\n"+text);}
  return ok;
}