function el(id) {return (e = document.getElementById(id))?e:false;}
function display(id,mode) {if (e = el(id)) {e.style.display=mode;}}
function undisplay(id) {if (e = el(id)) {e.style.display="none";}}
function show(id) {if (e = el(id)) {e.style.visibility="visible";}}
function hide(id) {if (e = el(id)) {e.style.visibility="hidden";}}
function setHtml(id,html) {if (e = el(id)) {e.innerHTML = html;}}
function setValue(id,value) {if (e = el(id)) {e.value = value;}}
function getValue(id) {if (e = el(id)) {return e.value;} else {window.alert("Can't get value of "+id);}}
function check(id) {if (e = el(id)) {e.checked = true;}}
function uncheck(id) {if (e = el(id)) {e.checked = false;}}
function isChecked(id) {return el(id).checked;}
function ajax(src) {if (e = el('AJAX')) {e.src = src;}}

function setSelectOptions(id,assoc) {
	var select = el(id);
	var value;
	var opt;
	for (value in assoc) {
		opt = new Option(assoc[value],value,false,false);
		select.options[select.options.length] = opt;
	}
}

function selectOption(id,value) {
	var i;
	var select = el(id);
	for (i = 0; i < select.options.length; i++) {
		if (select.options[i].value == value) {
			select.options[i].selected = true;
			return;
		}
	}
}

function base64_encode(input) {
	var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
	var output = ""; var chr1,chr2,chr3 = ""; var enc1,enc2,enc3,enc4 = ""; var i = 0;
	do {
		chr1 = input.charCodeAt(i++); chr2 = input.charCodeAt(i++); chr3 = input.charCodeAt(i++);
		enc1 = chr1 >> 2; enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); enc4 = chr3 & 63;
		if (isNaN(chr2)) {enc3 = enc4 = 64;}
		else if (isNaN(chr3)) {enc4 = 64;}
		output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) + keyStr.charAt(enc3) + keyStr.charAt(enc4);
		chr1 = chr2 = chr3 = ""; enc1 = enc2 = enc3 = enc4 = "";
	} while (i < input.length);
	return output;
}

function base64_decode(input) {
	var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
	var output = ""; var chr1, chr2, chr3 = ""; var enc1, enc2, enc3, enc4 = ""; var i = 0;
	var base64test = /[^A-Za-z0-9\+\/\=]/g;
	if (base64test.exec(input)) {alert("invalid characters in input: "+input);}
	input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
	do {
		enc1 = keyStr.indexOf(input.charAt(i++));
		enc2 = keyStr.indexOf(input.charAt(i++));
		enc3 = keyStr.indexOf(input.charAt(i++));
		enc4 = keyStr.indexOf(input.charAt(i++));
		chr1 = (enc1 << 2) | (enc2 >> 4);
		chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
		chr3 = ((enc3 & 3) << 6) | enc4;
		output = output + String.fromCharCode(chr1);
		if (enc3 != 64) {output = output + String.fromCharCode(chr2);}
		if (enc4 != 64) {output = output + String.fromCharCode(chr3);}
		chr1 = chr2 = chr3 = "";
		enc1 = enc2 = enc3 = enc4 = "";
	} while (i < input.length);
	return output;
}