function callajax(str)
		{
		
						
						
						getreq();
						
						//Build the required Query string
						var sPass=1;
						
						var retrieveParam = str;
						var retrieveParam = 'id='+ retrieveParam;
						
						var retrieveURL = "AJAXFILECHECK.aspx";
					
						var url = retrieveURL + '?' + retrieveParam;
						
						request.open('GET',url,true);
						
						request.onreadystatechange = filexists;
						
						request.send(null);
						
					
			
		}
		
		
		
		



function filexists() 
{
	var filename = document.getElementById("myfile").value;
    if(request.readyState == 4 ) 
    {
		
   
        if(request.status == 200)
        {
         
		var check = request.responseText;
		
          
             strStatus = check ;
            
					 if(strStatus=="False")
					 {
					
					    alert("file doesn't  Exist");
					  
					    who=document.getElementsByName('myfile')[0]; 
						var who2= who.cloneNode(false); 
						who2.onchange= who.onchange; 
						who.parentNode.replaceChild(who2,who); 
					    return false ;
					    
					 }
					 
					
        
        }
        
        
    }
		
}
 
function getreq() 
{
	
	try
	{
		request = new XMLHttpRequest();
	}
	catch(nething)
	{
		try
		{
			request = new ActiveXObject('Msxml2.XMLHTTP');
		}
		catch(othr)
		{
			try
			{
				request = new ActiveXObject('Microsoft.XMLHTTP');
			}
			catch(err)
			{
				request = false;
			}
		}
	}
	if(!request)
	{
		alert("Error initializing XMLHttpRequest object!");
	}
} 

private void Page_Load(object sender, System.EventArgs e)
		{
			// Put user code to initialize the page here
			string strStatus= string.Empty ;
			System.Text.StringBuilder strXml;

			if(Request.QueryString["id"]!=null)
			{
					
				string dirPath=Request.QueryString["id"];
				
				if (System.IO.File.Exists(dirPath)==true)

				{
					strStatus="True" ;
					strXml = new System.Text.StringBuilder (""); 
					strXml.Append(""+HttpUtility.HtmlEncode(strStatus)+"");
					
					

				}

				else
				{
					strStatus = "False" ;
					strXml = new System.Text.StringBuilder (""); 
					strXml.Append(""+HttpUtility.HtmlEncode(strStatus)+"");
					
				
				}
				Response.Write(strStatus);
				
						Response.ContentType = "text/xml";
				//				Response.CacheControl = "No-cache";
				//				xfile.Save(Response.OutputStream);
			}

			
		}