var btn_reset = document.getElementById('btn-reset');
btn_reset.onclick = function(){
	var main_form = document.getElementById('main_form');
	var inputs = main_form.getElementsByTagName('input');
	var selects = main_form.getElementsByTagName('select');
	for (var i=0; inputs.length>i; i++){
		if ( inputs[i].type=='text' ){
			inputs[i].value = '';
		} else if( inputs[i].type=='radio' || inputs[i].type=='checkbox' ){
			inputs[i].checked = false;
		}
	}
	for (var j=0; selects.length>j; j++){
		selects[j].selectedIndex = 0;
	}
	this.blur();
}