function select_checks(obj){
	var check = obj.checked;
	var form = document.getElementById('table');
	var arr = form.getElementsByTagName('input', 'checkbox');
	if(check == true){flag = true;}else{flag = false;}
	for(i = 0; i < arr.length; i++){if(arr[i] != obj)arr[i].checked = flag;}
}

function getElementsByType(array, type) {
	var result=new Array();
	for(i=0; i<array.length; i++){if(array[i].type==type)result.push(array[i]);}
	return result;
}