<?php $search_text = __( 'SEARCH', 'parabola' ); ?> 
<form method="get" id="searchform" action="<?php echo esc_url( home_url( '/' ) ); ?>">
<input type="text" value="<?php echo $search_text; ?>" name="s" id="s"
	onblur="if (this.value == '') {this.value = '<?php echo $search_text; ?>';}"
	onfocus="if (this.value == '<?php echo $search_text; ?>') {this.value = '';}" />
<input type="submit" id="searchsubmit" value="<?php _e( 'OK', 'parabola' ); ?>" />
</form>