function f()
{
 if(document.f2.sender_name.value=='')
{
alert("Please Enter Your Name");
document.f2.sender_name.focus();
return;
}
else if(document.f2.sender_name3.value=='')
{
alert("Please Enter Your Last Name");
document.f2.sender_name3.focus();
return;
}
else if (document.f2.address.value=='')
{
alert("Please fill Address");
document.f2.address.focus();
return;
}
else if (document.f2.tel.value=='')
{
alert("Please fill Phone Number");
document.f2.tel.focus();
return;
}
else if (document.f2.eaddress.value=='')
{
alert("Please fill EMail");
document.f2.eaddress.focus();
return;
}
else if (!/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(document.f2.eaddress.value))
{
alert("Please fill valid EMail");
document.f2.eaddress.focus();
return;
}
else if (document.f2.amount.value=='')
{
alert("Please Enter Amount");
document.f2.amount.focus();
return;
}
else if (isNaN(document.f2.amount.value))
{
alert("Please fill Valid Amount");
document.f2.amount.focus();
return;
}
else
{
 //alert ("OK!!!");
document.f2.submit();
}
}