function send_diff(ArtNo) {
	var form = document.getElementById('for_send');
	var dataString = '';
	var first = true;
//	var show=false;
	var value = '';
	document.getElementById('for_diff').innerHTML =dataString;

	for (i=0; i<form.elements.length; i++){
	value = '';
		if (form.elements[i].type == 'checkbox') {
			if (form.elements[i].checked==true) {
				value = form.elements[i].value;
			//	show=true;
			}
			else value = '';
		}
		if (value) {
			dataString += '=' + value;
		}
	}
	var num=dataString.split('=');
	if (num.length>2) {document.getElementById('send_dif').style.display ='block';
		document.getElementById('for_diff').innerHTML =dataString;
		document.getElementById('diff').value =dataString;
	}
	else document.getElementById('send_dif').style.display ='none';
}