String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}

function checkForm()
{
	var objForm = document.forms.book;
	if (objForm.t1.value.trim().length == 0) {
		alert("Please enter your name");
		return false;
	}
	if ((objForm.t2.value.trim().length == 0) || (!isBasicEmail(objForm.t2.value.trim()))) {
		alert("Please enter your email address");
		return false;
	}
	if ((objForm.t7.value.trim().length == 0) && (objForm.t3.value.trim().length == 0) && (objForm.t4.value.trim().length == 0) && (objForm.t6.value.trim().length == 0)) {
		alert("Please submit booking details or an enquiry");
		return false;
	}
	return true;
}

function isBasicEmail(strText)
{
	return (strText.indexOf(".") > 2) && (strText.indexOf("@") > 0);
}