To determine whether a remote picture exists

To determine whether a remote picture exists [ASP code]

Function Checkurl (ByVal a_strurl)
Set XMLHTTP = Server.CreateObject ("Microsoft.XMLHTTP")
Xmlhttp.open "Head", A_strurl,false
Xmlhttp.send ()
Checkurl= (xmlhttp.status=200)
Set XMLHTTP = Nothing
End Function
Dim Imgurl
Imgurl= "Uploadfiles/2007829144940734.gif"
If Checkurl (Imgurl) Then
Response.Write "Picture exists"
Else
Response.Write "Picture does not exist"
End If

To determine whether a remote picture exists [JS code]

{
var oreq = new ActiveXObject ("Microsoft.XMLHTTP")
Oreq.open ("Get", "Uploadfiles/2007829144941621.gif", false);
Oreq.send ();
Alert (Oreq.status)
if (oreq.status==404)
Alert (' does not exist ');
Else
Alert ("exist")
}

Here we use the XMLHTTP to read the image on the remote server and return the status.