ghost text is not working in ie9

I am using ghost text in all the browser it is working fine but in ie9 or ie8 not. step-1 load the page step-2 enter submit validation message came step3-place the cursor on particular field ghost text is not removing.(w/o enter submit button cursor placed on particular field ghost text is gone off).

My code as below.

<?php
echo $this->Form->input('service_address1', array(
    'id'        => 'address1',
    'div'       => false,
    'label'     => false, 
    'tabindex'  => '0',
    'class'     => 'form-bg',
    'maxlength' => 250,
    'value'     => 'Address',
    'onblur'    => "if(this.value=='') { this.value='Address'; }",
    "onfocus"   => "if(this.value == 'Address') { this.value = ''; }"
));
?>