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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script type="text/javascript">
function gestione_textbox(ID, valoredefault)
{
var element = document.getElementById(ID);
if(element.value == valoredefault)
{
element.value = "";
}
else if(element.value == "")
{
element.value = valoredefault;
}
}
</script>
<title>Pagina senza titolo</title>
</head>
<body>
<form id="form1" runat="server">
<div id="main" >
<asp:TextBox ID="TextBox1" runat="server" Text="0" onfocus=" gestione_textbox(this.id, '0');" onblur=" gestione_textbox(this.id,'0');" ></asp:TextBox>
</div>
</form>
</body>
</html>