function doValidate()
{
	//Ensure that before the validation starts, the hidden field is emptied
	document.forms['frmCallMe'].txtHiddenCallMe.value = '';

	//Start error-handling
	var blnErrMsg;
	var errMsg;
	var errMsg_Header;
	var errMsg_Details;
	var isValidEmail;
	
	blnErrMsg =			0;
	errMsg =			'';
	errMsg_Header =		'The following error(s) have occured:-\n';
	errMsg_Details =	'';
	
	//Validate main details within the form
	if(document.forms['frmCallMe'].txtFirstName.value!='')			{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|txtFirstName'};
	if(document.forms['frmCallMe'].txtLastName.value!='')			{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|txtLastName'};
	if(document.forms['frmCallMe'].txtCompanyName.value!='')		{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|txtCompanyName'};
	if(document.forms['frmCallMe'].txtCountryOfOrigin.value!='')	{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|txtCountryOfOrigin'};
	if(document.forms['frmCallMe'].txtTelephoneCode.value!='')	{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|txtTelephoneCode'};
	if(document.forms['frmCallMe'].txtTelephoneNumber.value!='')	{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|txtTelephoneNumber'};
	if(document.forms['frmCallMe'].txtEmail.value!='')				{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|txtEmail'};
	if(document.forms['frmCallMe'].selCallMe.value!='')				{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|selCallMe'};
	if(document.forms['frmCallMe'].selRelatedTo.value!='')			{document.forms['frmCallMe'].txtHiddenCallMe.value=document.forms['frmCallMe'].txtHiddenCallMe.value + '|selRelatedTo'};
	
	//Validate whether all the mandatory fields have been entered
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|txtFirstName")>=0)			{}else{errMsg_Details += '\n- First name is a mandatory value';}
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|txtLastName")>=0)			{}else{errMsg_Details += '\n- Last name is a mandatory value';}
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|txtCompanyName")>=0)			{}else{errMsg_Details += '\n- Company name is a mandatory value';}
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|txtCountryOfOrigin")>=0)		{}else{errMsg_Details += '\n- Country of Origin is a mandatory value';}
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|txtTelephoneCode")>=0)		{}else{errMsg_Details += '\n- Telephone (code) is a mandatory value';}
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|txtTelephoneNumber")>=0)		{}else{errMsg_Details += '\n- Telephone (number) is a mandatory value';}
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|txtEmail")>=0)				{}else{errMsg_Details += '\n- Email is a mandatory value';}
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|selCallMe")>=0)				{}else{errMsg_Details += '\n- Call me is a mandatory value';}
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.indexOf("|selRelatedTo")>=0)			{}else{errMsg_Details += '\n- Related to is a mandatory value';}
	
	//Validate whether all mandatory values have been entered
	//If they have, the length of the string in the hidden details field will be 127
	if(document.forms['frmCallMe'].txtHiddenCallMe.value.length!=127)
	{
		//Not all mandatory values have been entered
		blnErrMsg = 1;
		errMsg += errMsg_Details;
	}	
	
	//Create entire error string here
	if(blnErrMsg==1)
	{
		errMsg = errMsg_Header + errMsg_Details;
		alert(errMsg);
	}
	else
	{
		//All values have been supplied, perform a check to validate that the email address is syntactically correct
		isValidEmail = emailCheck(document.forms['frmCallMe'].txtEmail.value)
		if(isValidEmail)
		{
			//alert('ok to submit');
			document.forms['frmCallMe'].btnSubmit.disabled=true;
			document.forms['frmCallMe'].submit();
		}
	}
}

function emailCheck (emailStr) 
{
	var email_errMsg_Header = 'The following error(s) have occured:-\n';
	var emailPat=/^(.+)@(.+)$/
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	var validChars="\[^\\s" + specialChars + "\]"
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom=validChars + '+'
	var word="(" + atom + "|" + quotedUser + ")"
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
	var matchArray=emailStr.match(emailPat)

	if (matchArray==null) 
	{
		alert(email_errMsg_Header + "\nThe email address supplied seems to be invalid. (check @ and .'s)")
		return false
	}
												
	var user=matchArray[1]
	var domain=matchArray[2]

	if (user.match(userPat)==null) 
	{											    
		alert(email_errMsg_Header + '\nThe username in the email address is invalid')
		return false
	}
											
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) 
	{
		for (var i=1;i<=4;i++) 
		{
			if (IPArray[i]>255) 
			{
				alert("The Destination IP Address Is Invalid")
				alert(email_errMsg_Header + '\nThe destination IP address is invalid')
				return false
			}
		}
		return true
	}

	var domainArray=domain.match(domainPat)

	if (domainArray==null) 
	{
		alert(email_errMsg_Header + '\nThe email address supplied includes an invalid domain name')
		return false
	}
													
	var atomPat=new RegExp(atom,"g")
	var domArr=domain.match(atomPat)
	var len=domArr.length

	if (domArr[domArr.length-1].length<2 || domArr[domArr.length-1].length>4) 
	{
		alert(email_errMsg_Header + '\nThe email address supplied does not have a correct suffix (.co.uk, .com...)')
		return false
	}
	if (len<2) 
	{
		alert(email_errMsg_Header + '\nThe email address supplied is missing a hostname')
		return false
	}

	//If we've gotten this far, everything's valid	
	return true;
}