function checkData()
{
var bn = document.booking.name.value;
var bp = document.booking.phone.value;
var be = document.booking.email.value;
var bb = document.booking.datebox1.value;
var bf = document.booking.datebox2.value;
var ia = document.booking.IAgree.value;

if (bn.length == 0) { alert("Please fill in Booking Name. "); return false; }
if (bp.length == 0) { alert("Please fill in Phone Number. "); return false; }
if (be.length == 0) { alert("Please fill in Email Address."); return false; }
if (bb.length == 0) { alert("Please fill in Start Date.   "); return false; }
if (bf.length == 0) { alert("Please fill in End Date.     "); return false; }
if (ia != "Agree")  { alert("Please fill in Agree.        "); return false; }
}

function test()
{
alert("Please fill something in.") ;
}