Hide the initial content after activating the input box with javascript

<div>   
<label for="email">Email</label>   
<input name="email" type="text"  style="width:134px;" onfocus="if(==’Input your email’)=’’;"onblur="if(==’’)=’Input your email’;" value="Input your email" />   
<label for="pwd">Password</label>   
<input name="pwd" type="password"  style="width:132px;" onfocus="if(==’inputpass’)=’’;"onblur="if(==’’)=’inputpass’;" value="inputpass" />   
</div>