function checkform (form) {
  var emailID=form.email.value;
    
  if (form.realname.value == "") {
	alert("Please enter your first name.");
    form.realname.focus();
    return false ;
  }
  else if (form.lastname.value == "") {
	alert("Please enter your last name.");
    form.lastname.focus();
    return false ;
  }
  else if ((emailID == null)||(emailID == "")){
	alert("Please Enter your email address.");
	form.email.focus();
	return false;
  }
  else if (echeck(emailID) == false){
	form.email.value="";
	form.email.focus();
	return false;
  }
  else if (form.remail.value == "") {
	alert("Please re-enter your e-mail address.");
    form.remail.focus();
    return false ;
  }
  else if (form.remail.value != form.email.value) {
	alert("E-mail address does not match.");
    form.remail.focus();
    return false ;
  }
  else if(jcap() == false){
  	return false;
  }
  return true ;
}

function echeck(str) {
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	   alert("Invalid E-mail ID")
	   return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   alert("Invalid e-mail address.")
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
	   alert("Invalid e-mail address.")
		return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
	   alert("Invalid e-mail address.")
		return false
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
	   alert("Invalid e-mail address.")
		return false
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
	   alert("Invalid e-mail address.")
		return false
	 }
	
	 if (str.indexOf(" ")!=-1){
	   alert("Invalid e-mail address.")
		return false
	 }
	 return true
}