function chkAvailRoll()
{
	if (document.getElementById && document.createTextNode)
	{
		var chkimg=document.getElementById ('chkAvailImg');
		if (chkimg) 
		{
			chkimg.onmouseover=function(){chkimg.src="images/check_btn_ON.gif";return false}
			chkimg.onmouseout=function(){chkimg.src="images/check_btn_OFF.gif";return false}
		}
	}	
}

function preloadChkAvail()
{
	var dontcare = new Image();
	dontcare.src="images/chk_btn_ON.jpg";
}


function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

// do this to add new onload events: addLoadEvent(clickablePicLink); 
addLoadEvent(preloadChkAvail);
addLoadEvent(chkAvailRoll);

/* Date Guesser
** When you tab out of a date field, this script will try to convert the input
** to a sql-friendly string (i.e., YYYY-MM-DD).
** should recognize all sorts of date formats, including 
** 6/5/05; 			// ###
** Jun 5; 			// s#(#)
** 5 Jun;			// #s(#)
** June 5, 2005; 	// s#(#)
** 5 June, 2005; 	// #s(#)
** 6/5, 			// ##(#)
** 2005-12-25		// y##
** and anything else I can think of. The tricky
** part will be that 6/5 could be June, 2005, May 6, 2005, or June 5, 2005. But
** as long as we make a good guess, this will be a useful script
** Must be JavaScript 1.1 or higher
** To invoke this script, simply include it in your html file, and apply the 
** class "date" to any text input field that should have the script attached.
*/

addLoadEvent(addOnBlur);
var errorCheck = "";

var mon = Array("jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec")
var month = Array ("january","february","march","april","may","june","july","august","september","october","november","december");

var now = new Date();

function addOnBlur() {
	if (document.getElementById) {
		var inpTags = document.getElementsByTagName('input');
		for (var i=0; i<inpTags.length; i++) {
			if (inpTags[i].className=="date" && inpTags[i].type=="text") {
				inpTags[i].onblur=function(){guessDate(this);}
			}
		}
	}
}

function guessDate(objTextInput) {
	var numMonth= 0;	// default to this month
	var numDay	= 1;	// default to this date
	var numYear	= now.getFullYear();	// default to this year
	var thisMonth = now.getMonth();
	var bExplicitYear = false;	// true if we specifically have a year

	var strIn = objTextInput.value	
	if (!(strIn) || strIn=="") {
		return false;
	}
	strIn = strIn.replace(",","");
	parts = strIn.split(/[ \.\-\/\\]/);
	var Yval = Array (2);
	var Mval = Array (2);
	var Nval = Array (2);
	for (var abc in parts) {
		errorCheck += parts[abc] + "\n";
	}
	// only work with the first three parts
	// input is either n, m, y (n being a number that could be anything)
	// if m or y, assign it to the final output
	// loop over the remaining ns (that aren't Ms or Ys)
	// assume that month comes before date comes before year
	// FIRST PASS
	for (var i = 0; i<2; i++) {
		Yval[i] = isY(parts[i]);
		Mval[i] = isM(parts[i]);
		if (Yval[i]) {
			numYear = Yval[i]; 
			bExplicitYear = true;
		}
		if (Mval[i]) {
			numMonth = Mval[i]; 
		}
	}
	// SECOND PASS
	for (var i = 0; i<=2; i++) {
		Nval[i] = isN(parts[i]);
		errorCheck += "Nval[" + i + "]=" + Nval[i] + "\n";
		if (Nval[i] && !(Yval[i] || Mval[i])) {
			if (numMonth==0) {
				numMonth = pad (Nval[i], "0", 2);
				continue;
			}
			if (numDay==1) {
				numDay = pad (Nval[i], "0", 2);
				continue;
			}
			if (numYear==now.getFullYear()) {
				numYear = Nval[i] + 2000
				if (numYear - now.getFullYear() > 50) {
					numYear = numYear - 100;
				}
			}
		}
	}
	
	// if we weren't given a year, and if we're closer to next year than this 
	// year, guess next year instead
	if (!bExplicitYear && thisMonth > 8 && numMonth < thisMonth)
	{
		numYear++;
	}
	
	objTextInput.value = numYear+ "-" + numMonth + "-" + numDay;
	// alert (errorCheck);
	errorCheck = "";
}

function isN (inp) {
	errorCheck += "isN("+inp+")\n";
	if (isNaN(parseInt(inp, 10))) {
		return false;
	} else {
		errorCheck += "returning " + parseInt(inp, 10) + "\n";
		return parseInt(inp, 10);
	}
}

function isY (inp){
	if (isNaN(parseInt(inp, 10))) {
		return false
	} 
	if (inp > 32) {
		if (inp > now.getFullYear()-100) {
			return inp;
		}
	} else {
		return false;
	}
}

function isM (inp) {
	if (!(inp)) {
		return false;
	}
	var monthNumber
	for (var i = 0; i<mon.length; i++) {
		if (inp.toLowerCase() == mon[i]){
			monthNumber = i+1;
			break;
		}
	}
	for (i = 0; i<month.length; i++) {
		if (inp.toLowerCase() == month[i]) {
			monthNumber = i+1;
			break;
		}
	}
	if (monthNumber > 0) {
		return pad (monthNumber, "0", 2);
	} else {
		return false;
	}
}

function pad (strToPad, strWith, finalLen) {
	strToPad = strToPad + "";	// force numbers to be strings
	if (strToPad.length >= finalLen) { return strToPad }
	while (strToPad.length < finalLen) {
		strToPad = strWith.concat(strToPad)
	}
	return strToPad
}