function isBlank(s)
{
	var len=s.length;
	var i;
	for(i=0;i<len;++i)
	{
		if(s.charAt(i)!=" ") return false;
	}
	return true;
}

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)
	{
	  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					
}

function check_form()
{
	if (isBlank(document.enquiry_form.FirstName.value))
	{
		alert('Please enter the first name.');
		document.enquiry_form.FirstName.focus();
		return false;
	}
	if (isBlank(document.enquiry_form.LastName.value))
	{
		alert('Please enter the last name.');
		document.enquiry_form.LastName.focus();
		return false;
	}
	if(isBlank(document.enquiry_form.Email.value))
	{
		alert('Please enter the email address');
		document.enquiry_form.Email.focus();
		return false;
	}
	if(!echeck(document.enquiry_form.Email.value))
	{
		alert('Please enter a valid email address');
		document.enquiry_form.Email.focus();
		return false;
	}
	if(isBlank(document.enquiry_form.Enquiry.value))
	{
		alert('Please enter the enquiry');
		document.enquiry_form.Enquiry.focus();
		return false;
	}
}