function observeTextarea() {
	
	removeTextFromTextareaBind = removeTextFromTextarea.bindAsEventListener();
	
	
	
	Event.observe('input_text', 'click', removeTextFromTextarea ) ;
	Event.observe('document_to_send_text','click',enableTextarea) ;
	
}

function removeTextFromTextarea() {

	content = $('input_text').value ;
	if(content[0] == "-") {
		$('input_text').value = '' ;
	}
	Event.stopObserving('input_text', 'click', removeTextFromTextarea);

}


function enableTextarea() {
	
	$('label_file_to_send').setStyle({ color: '#000'}) ;
	$('label_text_to_send').setStyle({ color: '#000'}) ;
	$('input_file').disabled = true ;
	$('input_text').disabled = false ;
	
}