// Global lookup arrays for base64 conversions
var dec64List = null;

// Load the lookup arrays once
function initBase64() {
	var enc64List = new Array();
	
	dec64List = new Array();
	var i;
	for (i = 0; i < 26; i++) {
		enc64List[enc64List.length] = String.fromCharCode(65 + i);
	}
	for (i = 0; i < 26; i++) {
		enc64List[enc64List.length] = String.fromCharCode(97 + i);
	}
	for (i = 0; i < 10; i++) {
		enc64List[enc64List.length] = String.fromCharCode(48 + i);
	}
	enc64List[enc64List.length] = "+";
	enc64List[enc64List.length] = "/";
	
	dec64List = new Array();
	var i;
	for (i = 0; i < 128; i++) {
		dec64List[dec64List.length] = -1;
	}
	for (i = 0; i < 64; i++) {
		dec64List[enc64List[i].charCodeAt(0)] = i;
	}
}


function base64Decode(str) {
	if (null == dec64List)	// Self-initialize the global variables
		initBase64();

	var c=0, d=0, e=0, f=0, i=0, n=0;
	var input = str.split("");
	var output = "";
	var ptr = 0;
	do {
		f = input[ptr++].charCodeAt(0);
		i = dec64List[f];
		if ( f >= 0 && f < 128 && i != -1 ) {
			if ( n % 4 == 0 ) {
				c = i << 2;
			} else if ( n % 4 == 1 ) {
				c = c | ( i >> 4 );
				d = ( i & 0x0000000F ) << 4;
			} else if ( n % 4 == 2 ) {
				d = d | ( i >> 2 );
				e = ( i & 0x00000003 ) << 6;
			} else {
				e = e | i;
			}
			n++;
			if ( n % 4 == 0 ) {
				output += String.fromCharCode(c) + 
						  String.fromCharCode(d) + 
						  String.fromCharCode(e);
			}
		}
	}
	while (typeof input[ptr] != "undefined");
	
	output += (n % 4 == 3) ? String.fromCharCode(c) + String.fromCharCode(d) : 
			  ((n % 4 == 2) ? String.fromCharCode(c) : "");
	return output;
}

function linkTo_UnCryptMailto (s) {
	location.href = 'mailto:' + base64Decode(s);
}

function clearDefault(el) {
	if (el.defaultValue == el.value) {
		el.value = "";
		el.style.color = 'black';
	}
}