function validateForm() {

	if ( coveringLetterCheck() ) {
		this.submit.value='Please wait...';
		this.submit.disabled=true;
		return true;
	}
	else {
		alert( 'Please enter a covering letter.' );
		return false;
	}

}

function coveringLetterCheck() {
	var C = document.getElementById('covering_letter');
	
	if ( C.value == '' ) {
		//alert( "Please enter a covering letter." );
	}
	
	return true;
}