Converting normal textbox into password textbox on clicking on the textbox

In this tutorial i will show how can u show the text in the textbox which is having TextMode=password but when clicked on that textbox it converts it to the password textbox.
Steps:
Take one textbox & set its TextMode to password.
now go to source mode of visual studio write this in the textbox

onfocus="if(this.value =='PASSWORD')this.value='';" onblur="if(this.value==''){this.value='PASSWORD';this.TextMode='SingleLine';}"

After adding this what happens is .....
It will initially show text "PASSWORD".
After that when you click on it ..it will be converted password textbox which will show text as "*"

your textbox markup should look something like this....

 < asp:TextBox ID="Password" runat="server" TextMode="Password"
  onfocus="if(this.value =='PASSWORD')this.value='';"    onblur="if(this.value==''){this.value='PASSWORD';this.TextMode='SingleLine';}">PASSWORD< /asp:TextBox>