for asp.net
<asp:TextBox ID="txtUserName"
Text ='Enter User Name'
onFocus="if (this.value == 'Enter User Name' ||
this.value == 'User Name Not found' ||
this.value == 'Password Not found' ||
this.value == 'User Name and Password Mismatch')
{
this.value = '';
this.style.color = 'Black';
this.style.fontStyle = 'normal';
}"
onBlur="if (this.value == '')
{
this.style.color = 'gray';
this.value = 'Enter User Name';
this.style.fontStyle = 'italic';
}"
AutoCompleteType="Disabled"
class="flatboxlogin"
runat="server"
BackColor="Transparent"
BorderColor="Transparent"
Font-Italic ="true"
ForeColor="gray">
EDIT ===========
Made your code snippet more readable.
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