// JavaScript Document

function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         //IsNumber = false;
		 alert ("Invalid Quantity");
		 return false;
         }
      }
   //return IsNumber;
   return true;
   
   }
   
function IsNumeric_guest(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
		 return false;
         }
      }
   //return IsNumber;
   return true;
   
   }
   
function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}





function varify()
{
if (document.f1.guestno.value==""){
alert("Please enter number of Guest");
document.f1.guestno.focus();
return (false);
}
var guest = document.f1.guestno;
if (! IsNumeric_guest(guest.value)){
alert("Please enter only digit characters in the \"Number Of Guest\" field.");
guest.focus();
return (false);
}
if (document.f1.fname.value==""){
alert("Please enter your first name");
document.f1.fname.focus();
return (false);
}
if(document.f1.lname.value==""){
alert("Please enter Last name");
document.f1.lname.focus();
return (false);
}
if(document.f1.nationality.value=="none"){
alert("Please enter your nationality");
document.f1.nationality.focus();
return (false);
}
if(document.f1.phone.value==""){
alert("Please enter contact no:");
document.f1.phone.focus();
return (false);
}
var emailID=document.f1.email
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return (false)
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return (false)
	}
}