function checkform()
{
    var message="Please complete the following fields and try again:\n";
    var error="false";
    var invalid="false";
    if(document.form.first_name.value=="")
    {
    	message=message+"-First Name\n";
    	error = "true";
    }
    if(document.form.last_name.value=="")
    {
        message=message+"-Last Name\n";
        error="true";
    }
    if(document.form.email.value=="" && document.form.phone.value=="")
    {
        message=message+"-Phone or Email\n";
        error="true";
    }
    if(document.form.state.value=="")
    {
        message=message+"-State";
        error="true";
    }
    
    if(error=="false")
    {
        message="Please correct the following errors and try again:\n";
        invalid="true";
    }
    
    
    if(document.form.email.value!="" && validateEmail(document.form.email.value) == false)
    {
    	if(invalid=="false")
        {
            message=message+"\n\nPlease correct the following errors and try again:\n";
    	}
        message=message+"-Invalid Email\n"
	error="true";
	invalid="true";
    }
    if(document.form.phone.value!="" && checkPhone(document.form.phone.value)==false)
    {
    	if(invalid=="false")
        {
            message=message+"\n\nPlease correct the following errors and try again:\n";
    	}
	message=message+"-Invalid Phone Number"
	error="true";
	invalid="true";
    }
    
    if(error=="true")
    {
	alert(message);
	return false;
    }
    else
    {
	document.form.submit();
    }
}

function validateEmail(str)
{
 var at="@"
 var dot="."
 var lat=str.indexOf(at)
 var lstr=str.length
 var ldot=str.indexOf(dot)
 if (str.indexOf(at)==-1){
    return false
 }

 if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
    return false
 }

 if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
    return false
 }

 if (str.indexOf(at,(lat+1))!=-1){
    return false
 }

 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
    return false
 }

 if (str.indexOf(dot,(lat+2))==-1){
    return false
 }

 if (str.indexOf(" ")!=-1){
    return false
 }

 return true
}

// Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- .";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}
function trim(s)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not a whitespace, append to returnString.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
function checkPhone(str){
var bracket=3
str=trim(str)
if(str.indexOf("+")>1) return false
if(str.indexOf("(")!=-1 && str.indexOf(")")==-1)return false
if(str.indexOf("(")==-1 && str.indexOf(")")!=-1)return false
s=stripCharsInBag(str,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}