function checkform (form)
{

      if (form.First_Name.value == "") {
    alert( "Please Fill in your First Name" );
    form.First_Name.focus();
    return false ;
  }
      if (form.Last_Name.value == "") {
    alert( "Please Fill in your Last Name" );
    form.Last_Name.focus();
    return false ;
  }
      if (form.Phone.value == "") {
    alert( "Please Fill in your Phone Number" );
    form.Phone.focus();
    return false ;
  }
      if (form.Email.value == "") {
    alert( "Please Fill in your Email Address" );
    form.Email.focus();
    return false ;
  }
    if (form.Comments_Questions.value == "") {
    alert( "Please Fill in Comments or Questions" );
    form.Comments_Questions.focus();
    return false ;
  }
  
  return true ;
}

function checkEmail(form) {
if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(form.Email.value)){
return (true)
}
alert("Please Enter A Valid Email Address")
return (false)
}


var digits = "0123456789";
var phoneNumberDelimiters = "()- ";
var validWorldPhoneChars = phoneNumberDelimiters + "+";
var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    return true;
}

function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";

    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function ValidateForm(){
	var Phone=document.form.Phone
	
	if ((Phone.value==null)||(Phone.value=="")){
		alert("Please Enter a Valid Phone Number")
		Phone.focus()
		return false
	}
	if (checkInternationalPhone(Phone.value)==false){
		alert("Please Enter a Valid Phone Number")
		Phone.value=""
		Phone.focus()
		return false
	}
	return true
 }