function checkBookNow(f){
err="";
if(f.name.value=="")
	err+=" - name is required. \n";
if(!validemail(f.email.value))
	err+=" - email is required. \n";
if(f.phone.value=="")
	err+=" - phone no. is required. \n";
if(f.checkindate.value=="")
	err+=" - check-in date is required. \n";
if(f.checkoutdate.value=="")
	err+=" - check-out date is required. \n";
if(err!=""){
	err="Following are the errors:\n\n"+err;
	alert(err);
	return false;
} else { 
	return true;
}
}

function validemail(email){
invalidchar="/:,;"
if (email==""){ return false }
for (i=0;i<invalidchar.length;i++){
	badchar=invalidchar.charAt(i)
	if (email.indexOf(badchar,0)>-1){ return false }
}
atpos=email.indexOf('@',1)
if (atpos==-1){ return false }
periodpos=email.indexOf(".",atpos)
if (periodpos ==-1) {return false}
if (periodpos+3 >email.length) {return false}
return true
}