function CheckEmail(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 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 = 'White';
} 
else if (!(stripped.length >= 8 && stripped.length <= 15)) {
error = "The phone number is the wrong length.\n";
fld.style.background = 'Yellow';
}
return error;
}

function Validate()
{
if(document.getElementById('Name').value.replace(/^\s+|\s+$/g, '') == "")
{
alert("Name is required, please enter a valid name!");
document.getElementById('Name').focus();
return false;
}

if(!CheckEmail(document.getElementById('Email').value))
{
alert("Invalid E-mail Address!");
return false;
}

if (validatePhone(document.getElementById('Phone')) != "")
{
alert("Phone is required, please enter a valid phone number!");
return false;
} 

if(document.getElementById('comments').value.replace(/^\s+|\s+$/g, '') == "")
{
alert("Comments are required, please enter a brief description of your enquiry!");
document.getElementById('comments').focus();
return false;
}

return true;
}