Hi,
I am new in ajax.
I am using a calender in javascript.& also using ajax code for form validation n submission.
but calender is not working if i use ajax
Need suggestions.

<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="script.js"></script>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="requirement_validation.js"></script>
<script type="text/javascript">jQuery(document).ready(function($) {$('a[rel*=facebox]').facebox() })</script>

<link rel="stylesheet" media="screen" href="styles/vlaCal-v2.1.css" type="text/css" />
<script type="text/javascript" src="jslib/mootools-1.2-core-compressed.js"></script>
<script type="text/javascript" src="jslib/vlaCal-v2.1-compressed.js"></script>

<script type="text/javascript">
$(function() {

function isValidEmailAddress(emailAddress) {
var pattern = new RegExp(/^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i);
return pattern.test(emailAddress);
};
$(document).ready(function()
{ 

	$("#username").blur(function()
	{
		//remove all the class add the messagebox classes and start fading
		$("#msgbox").removeClass().addClass('messagebox').text('Checking...').fadeIn("slow");
		//check the username exists or not from ajax
		$.post("user_availability.php",{ username:$(this).val() } ,function(data)
        {
		  if(data=='no') //if username not avaiable
		  {
		  	$("#msgbox").fadeTo(200,0.1,function() //start fading the messagebox
			{ 
			  //add message and change the class of the box and start fading
			  $(this).html('This email Already exists').addClass('messageboxerror').fadeTo(900,1);
			  $("#password").attr("disabled", "disabled");
			  $("#rpassword").attr("disabled", "disabled");
			  $("#mobile").attr("disabled", "disabled");
			  $("#city").attr("disabled", "disabled");
			  $("#name").attr("disabled", "disabled");
			  $("#type").attr("disabled", "disabled");
			});		
          }
		  else
		  {
		  	$("#msgbox").fadeTo(200,0.1,function()  //start fading the messagebox
			{ 
			  //add message and change the class of the box and start fading
			  $(this).html('Email available to register').addClass('messageboxok').fadeTo(1000,1);
			});
		  }
				
        });
 
	});
});

$(".submit").click(function() {

    var name = $("#name").val();
	var username = $("#username").val();
	var password = $("#password").val();
	var type = $("#type").val();
	var mobile=	$("#mobile").val();
	var city=$("#city").val();
	var rpassword=$("#rpassword").val();
    var dataString = 'name='+ name + '&username=' + username + '&password=' + password + '&rpassword=' + rpassword+ '&type=' + type + '&mobile=' + mobile + '&city=' + city;
	if(name=='' || username=='' || password=='' || rpassword=='' || type=='' || city=='' || mobile=='')
	{
	$('.success').fadeOut(200).hide();
    $('.error').fadeOut(200).show();
    $('.pwd_error').fadeOut(200).hide();
    $('.error1').fadeOut(200).hide();
    $('#msgbox').fadeOut(200).hide();
    $("#msgbox").fadeTo(200,0.1,function()  //start fading the messagebox
	{ 
	  //add message and change the class of the box and start fading
	  $(this).html('Email available to register').addClass('messageboxok').fadeTo(1000,1).hide();
	});
	}
	
	else if( !isValidEmailAddress(username) ) 
	  { 
	   $('.success').fadeOut(200).hide();
       $('.error').fadeOut(200).hide();
       $('.error1').fadeOut(200).show();
       $('.pwd_error').fadeOut(200).hide();
       $('#msgbox').fadeOut(200).hide();
       $("#msgbox").fadeTo(200,0.1,function()  //start fading the messagebox
	{ 
	  //add message and change the class of the box and start fading
	  $(this).html('Email available to register').addClass('messageboxok').fadeTo(1000,1).hide();
	});
	  }
	  
	else if(!(password==rpassword))
	{
	 $('.success').fadeOut(200).hide();
     $('.error').fadeOut(200).hide();
     $('.pwd_error').fadeOut(200).show();
     $('.error1').fadeOut(200).hide();
     $('#msgbox').fadeOut(200).hide();
  	$("#msgbox").fadeTo(200,0.1,function()  //start fading the messagebox
	{ 
	  //add message and change the class of the box and start fading
	  $(this).html('Email available to register').addClass('messageboxok').fadeTo(1000,1).hide();
	});

	}
	else
	{
	$.ajax({
	type:"POST",
    url:"join.php",
    data:dataString,
    success: function(){
	$('.success').fadeIn(200).show();
    $('.error').fadeOut(200).hide();
    $('.pwd_error').fadeOut(200).hide();
    $('.error1').fadeOut(200).hide();
    $('#msgbox').fadeOut(200).hide();

    $('#name').val('');
    $('#type').val('');
    $('#password').val('');
    $('#rpassword').val('');
    $('#username').val('');
    $('#mobile').val('');
    $('#city').val('');
		
   }
});

	}
		
    return false;
	});

});
</script>

It could be because you are using 2 different JavaScript Libraries.

http://docs.jquery.com/Using_jQuery_with_Other_Libraries

You will need to figure out what code is using what library and rewrite it accordingly.

Also, could you provide a proper explanation as to what is going wrong? Saying, "Something isn't working", without giving an explanation or error messages makes it harder to figure out.