<!-- Example form using onfocus/onblur events -->
<form action="#" method="post">
    <input type="text" name="email" id="email" value="enter your e-mail address" onblur="if(this.value=='') this.value='enter your e-mail address';" onfocus="if(this.value=='enter your e-mail address') this.value='';" />
    <br /><br />
    <textarea cols="40" rows="10" name="message" id="message" onfocus="if(this.value==this.defaultValue) this.value='';" onblur="if(this.value=='') this.value=this.defaultValue;">enter your message...</textarea>
    <br /><br />
    <input type="submit" value="Submit" class="submit" />
</form>

<!-- Live demo here: http://jsfiddle.net/yQvE7/ -->