Default text disappear from textbox with javascript

//form action="http://www.domain.com" method="post">
//input type="text" size="25" value="Enter Your Default Text Here" onFocus="if(this.value == 'Enter Your Default Text Here') {this.value = '';}" //onBlur="if (this.value == '') {this.value = 'Enter Your Default Text Here';}" />
//input type=submit value=Submit>
///FORM>