function xmlhttp_open(src, formdata, index)
{
	/* megnyitja az 'index'-edik HTTPRequest csatornajat, elkuldi a HTTP kerest 'src' url-lel.
	 * Feltetelezi, hogy az index egy ervenyes, es kuldesre kesz csatorna indexe.
	 * Feltetelezi, hogy az xmlhttp_obj_tomb[index] erteke, azaz a celobjektum idoben be lett allitva.
	**/
	init_xmlhttp(index);
	
	xmlhttp_tomb[0].onreadystatechange = statechange0;
	xmlhttp_tomb[1].onreadystatechange = statechange1;
	xmlhttp_tomb[2].onreadystatechange = statechange2;
	xmlhttp_tomb[3].onreadystatechange = statechange3;
	xmlhttp_tomb[4].onreadystatechange = statechange4;
	xmlhttp_tomb[5].onreadystatechange = statechange5;
	xmlhttp_tomb[6].onreadystatechange = statechange6;
	xmlhttp_tomb[7].onreadystatechange = statechange7;
	xmlhttp_tomb[8].onreadystatechange = statechange8;
	xmlhttp_tomb[9].onreadystatechange = statechange9;
	
	xmlhttp_tomb[index].open("POST", src, true);
	xmlhttp_tomb[index].setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	xmlhttp_tomb[index].send(formdata);
}