OnFocus Problem in Javascript

[Noorain]

i use php,mysql & javascript for this project.

i use textbox for phone. i use 11 digit for that. first 3 digit(017) fixed for that.when cursor focus that field auto 017 set there. don't delete or insert another digit for that 017 digit. please help me............. .

my problem:
[CODE=html]<input type="text" name="phone" id="phone" onFocus="this.v alue='017'" value="" size="20" maxlength="11" />[/CODE]

[gits]

why don't just use a readonly textbox here? like:

[HTML]<input type="text" name="your_fiel d_name" size="4" value="017" readonly="reado nly"/>
<input type="text" name="phone" id="phone" size="20" maxlength="11"/>[/HTML]
kind regards

[Noorain]

why don't just use a readonly textbox here? like:

[HTML]<input type="text" name="your_fiel d_name" size="4" value="017" readonly="reado nly"/>
<input type="text" name="phone" id="phone" size="20" maxlength="11"/>[/HTML]
kind regards

thanks.
now how to add 2 textbox value in one textbox.please tell me.....

[gits]

thanks.
now how to add 2 textbox value in one textbox.please tell me.....

whatfor? just use 2 textboxes or use css to make them appear as one ...

kind regards