function validateTrialForm(theForm) {
var reason = "";

  reason += validateName(theForm.Name);	//surname
  //reason += validateLastname(theForm.l_name);		//forename
  reason += validateEmail(theForm.Email);		//email
  
  //reason += validatePhone(theForm.phone);	//telephone
 // alert(reason);
  //reason += validateEmpty(theForm.company_name);	//company
  reason += validateComments(theForm.Details);

      
  if (reason != "") {
    alert("Some fields need correction:\n" + reason);
    return false;
  }
  else { return true; }
}

function validateEmpty(fld) {
    var error = "";
 
    if (fld.value.length == 0) {
        fld.style.background = 'Yellow'; 
        error = "The required field has not been filled in.\n"
    } else {
        fld.style.background = 'White';
    }
    return error;  
}


function validateName(fld) {
    var error = "";
    var illegalChars = /\W/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter a Name.\n";
    } else if ((fld.value.length < 2) || (fld.value.length > 15)) {
        fld.style.background = 'Yellow'; 
        error = "The Name is the wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "The Name contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

function validateLastname(fld) {
    var error = "";
    var illegalChars = /\W/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter a Lastname.\n";
    } else if ((fld.value.length < 2) || (fld.value.length > 15)) {
        fld.style.background = 'Yellow'; 
        error = "The Lastname is the wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "The LastName contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}

function validatePost_applied(fld) {
	 var error="";
	var dt = fld.value;
	var dtFilter =	/^[a-zA-Z0-9 _]*$/ ;
	if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter an the post.\n";
    }
	else if(!dtFilter.test(dtfld)){
		fld.style.background = 'Yellow';
        error = "Please enter a valid skills.\n";
	}
	else {
		fld.style.background = 'White';
	}
	
   /* var error = "";
    var illegalChars = /\W/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
       fld.style.background = 'Yellow'; 
        error = "Enter the Post applying a.\n";
    } else if ((fld.value.length < 5) || (fld.value.length > 15)) {
       fld.style.background = 'Yellow'; 
        error = "Wrong Lenght.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "The Post Applied contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }*/
    return error;
}

function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
}

function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
   
    if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter an email address.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'Yellow';
        error = "Please enter a valid email address.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'Yellow';
        error = "The email address contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }
    return error;
}


/*function validatePhone(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');    

   if (fld.value == "") {
        error = "You didn't enter a phone number.\n";
        fld.style.background = 'Yellow';
    } else if (isNaN(parseInt(stripped))) {
        error = "The phone number contains illegal characters.\n";
        fld.style.background = 'Yellow';
    } /*else if (!(stripped.length == 12)) {
        error = "The phone number is the wrong length. Make sure you included an area code.\n";
        fld.style.background = 'Yellow';
    }
	
    return error;
}*/

function validateComments(fld){
    var error = "";
   	var dtskills = fld.value;
	var dtFilter =	/^[a-zA-Z0-9 _]*$/ ;
	
	if (fld.value == "") {
        fld.style.background = 'Yellow';
        error = "You didn't enter an the Details.\n";
    }
	else if(!dtskills.test(dtfld)){
		fld.style.background = 'Yellow';
        error = "Please enter a valid Details.\n";
	}
	else {
		fld.style.background = 'White';
	}
   
   
   /* var illegalChars = /\W/; // allow letters, numbers, and underscores
 
    if (fld.value == "") {
        fld.style.background = 'Yellow'; 
        error = "You didn't enter a Skills.\n";
    } else if ((fld.value.length < 5) || (fld.value.length >50)) {
        fld.style.background = 'Yellow'; 
        error = "The Skills wrong length.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'Yellow'; 
        error = "The It contains illegal characters.\n";
    } else {
        fld.style.background = 'White';
    }*/
	return error;		
	
}

function rmv_class(id)	{
	id.style.background = 'White';
}