// 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 validate_enquiry(form){
var radio_choice = false;
if(form.enquiry_type1.value ==""){
    alert("Please select enquiry type");
    form.enquiry_type1.focus();
    return false;
}

else if(form.enquiry_type1.value =="other" && form.enquiry_type2.value == ""){
    alert("Please state enquiry type");
    form.enquiry_type2.focus();
    return false;
}

else if(form.enquiry_type1.value =="Customer Support" && form.support_subject.value == ""){
    alert("Please state support subject");
    form.support_subject.focus();
    return false;
}

else if(form.enquiry_type1.value =="Customer Support" && form.support_domain.value == ""){
    alert("Please state your domain");
    form.support_domain.focus();
    return false;
}

else if (form.name.value == ""){
    alert("The name cannot be empty");
    form.name.focus();
    return false;

}

else if(form.email.value ==""){
    alert("The email cannot be empty");
    form.email.focus();
    return false;
}

else if(evalid(form.email.value) == false){ 
    form.email.focus();
    return false;
}

/*else if(form.contact.value !=""){
    alert("The contact number cannot be empty");
    form.contact.focus();
    return false;
}*/

else if(form.contact.value !="" && checkPhone(form.contact.value) == false){
    alert("Invalid Contact Number!");
    form.contact.focus();
    return false;
}



else if(form.message.value ==""){
    alert("Please leave us a message.");
    form.message.focus();
    return false;
}


for (counter = 0; counter <form.heard.length; counter++)
{

if (form.heard[counter].checked)
radio_choice = true; 
}

if (!radio_choice)
{
 alert( "Please state how you get to us." );
 form.heard[0].focus();
return false;
}

else if(form.captcha_input.value ==""){
    alert("Please fill in the verification code.");
    form.captcha_input.focus();
    return false;
}



return true;
}


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 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 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 checkPhone(strPhone){
var bracket=3
strPhone=trim(strPhone)
if(strPhone.indexOf("+")>1) return false
if(strPhone.indexOf("-")!=-1)bracket=bracket+1
if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
var brchr=strPhone.indexOf("(")
if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
s=stripCharsInBag(strPhone,validWorldPhoneChars);
return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

function evalid(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!")
		   return false
		}

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

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

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

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

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

 		 return true					
	}