Question

I am trying to validate a phone number. The website is US based but the clients can be from all over the world. I am using jQuery to validate the input. I would be very thankful for the hints given for validation. Thanks.

<input 
     name="phone"  
     type="text" 
     id="phone" 
     minlength="7"
     maxlength="15" 
     style="
               font-family: Verdana;
               color:#FFFFFF;
               font-size: 13px;
               background-color: #0E0E0F;
               border: 1px solid #740086;
               width:385px;
               margin-bottom:10px;
           "
     size="385"
     value="Phone #"
     onfocus="if(this.value==this.defaultValue)this.value='';" 
     onblur="if(this.value=='')this.value=this.defaultValue;"/>

Answer 1

User JQuery validation engine..its easy..cool and the cleanest validation framework I have seen yet..http://www.position-relative.net/creation/formValidator/
This plugin already take care for phone number validation..if thats not sufficient then you can add your own custom regular expression to perform the validation.