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 trim(s)
{   var i;
    var returnString = "";
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}
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){
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 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 Email address")
		   return false
		}

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

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

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

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

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

 		 return true					
	}


function validateinputs(){

	if (document.TTP_trial.firstname.value == ''){
		alert("Please enter your first name.")
		return false
	}
		if (document.TTP_trial.lastname.value == ''){
		alert("Please enter your last name.")
		return false
	}
			if (document.TTP_trial.position.value == ''){
		alert("Please enter your job title.")
		return false
	}

	if (document.TTP_trial.company.value == ''){
		alert("Please fill out the Company field.")
		return false
	}
	
		if (document.TTP_trial.address.value == ''){
		alert("Please fill out the Address field.")
		return false
	}
	
			if (document.TTP_trial.city.value == ''){
		alert("Please fill out the City field.")
		return false
	}
	
	
			if (document.TTP_trial.postcode.value == ''){
		alert("Please enter your post code.")
		return false
	}
	
	
	
		var Phone=document.TTP_trial.telephone
	
		if ((Phone.value==null)||(Phone.value=="")){
		alert("Please Enter your telephone number")
		Phone.focus()
		return false
	}
	if (checkInternationalPhone(Phone.value)==false){
		alert("Please Enter a valid telephone number")
		Phone.value=""
		Phone.focus()
		return false
	}	


		var emailID=document.TTP_trial.from
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please fill out the Email field")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	
		if(document.TTP_trial.understood_terms.checked == '')
{alert("Please confirm you have read and understood the terms and conditions attached to the use of this service")
return false} 
	{	
		return true;
	}
 }