Javascript disappearing in-field form labels

Javascript disappearing in-field form labels.html

<form name="signup" action="http://forms.marylandrieu.com/save" method="post">
      <input type="hidden" name="ActivityCode" value="join" />
  <input type="hidden" name="SuccessUrl" value="http://www.marylandrieu.com/privacy/?id=0002" />


<input name="EmailAddress" id="dataEmail" class="input" style="width: 130px" onmouseover="style.borderColor='#d6eafa';" onmouseout="style.borderColor='#5484ab';" onblur="if(this.value=='')this.value='Enter Your Email Address';style.borderColor='#5484ab';" onfocus="if(this.value=='Enter Your Email Address')this.value='';style.borderColor='#d6eafa';" value="Enter Your Email Address" />

<input type="text" name="PostalCode" class="input" style="width: 50px" onmouseover="style.borderColor='#d6eafa';" onmouseout="style.borderColor='#5484ab';" onblur="if(this.value=='')this.value='Zip Code'; style.borderColor='#5484ab';" onfocus="if(this.value=='Zip Code')this.value=''; style.borderColor='#d6eafa';" value="Zip Code" />

<input class="submit" type="submit" name="Submit" value="GO" style="width: 30px" onmouseover="style.borderColor='#d6eafa';" onfocus="style.borderColor='#d6eafa';" onmouseout="style.borderColor='#5484ab';" onblur="style.borderColor='#5484ab';" />

</form>