function isValidEmail(str) {
return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
}
function CheckData()
{
with(document.mailform)
{
if(comments.value == "")
{
alert("Please write Query.");
comments.focus();
return false;
}
if(name.value == "")
{
alert("Please Enter Your Name");
name.focus();
return false;
}
if(company.value == "")
{
alert("Please Enter Your Company Name");
company.focus();
return false;
}
if(address.value == "")
{
alert("Please Enter Your Address");
address.focus();
return false;
}
if(phone.value == "")
{
alert("Please Enter Your Phone Number");
phone.focus();
return false;
}
if(fax.value == "")
{
alert("Please Enter Your Fax Number");
fax.focus();
return false;
}
if(email.value == "")
{
alert("Please Enter Your Email Address");
email.focus();
return false;
}
if (!isValidEmail(email.value)) 
{
alert("Please enter a valid email address");
return false;
}
}
return true;
}