(function($) {
    var methods = {
        dateIsValid: function(dtStr) {
            /**
             * jQuery static function adaptation of the DHTML date validation script as
             * found on SmartWebby.com (http://www.smartwebby.com/dhtml/)
             */
            var dtCh= "/";
            var minYear=1900;
            var maxYear=2100;

            function isInteger(s){
            	var i;
                for (i = 0; i < s.length; i++){
                    var c = s.charAt(i);
                    if (((c < "0") || (c > "9"))) return false;
                }
                return true;
            }
            function stripCharsInBag(s, bag){
            	var i;
                var returnString = "";
                for (i = 0; i < s.length; i++){   
                    var c = s.charAt(i);
                    if (bag.indexOf(c) == -1) returnString += c;
                }
                return returnString;
            }
            function daysInFebruary (year){
                return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
            }
            function DaysArray(n) {
            	for (var i = 1; i <= n; i++) {
            		this[i] = 31;
            		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30;}
            		if (i==2) {this[i] = 29;}
               } 
               return this;
            }
            var daysInMonth = DaysArray(12);
            var pos1=dtStr.indexOf(dtCh);
        	var pos2=dtStr.indexOf(dtCh,pos1+1);
        	var strMonth=dtStr.substring(0,pos1);
        	var strDay=dtStr.substring(pos1+1,pos2);
        	var strYear=dtStr.substring(pos2+1);
        	strYr=strYear;
        	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1);
        	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1);
        	for (var i = 1; i <= 3; i++) {
        		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1);
        	}
        	month=parseInt(strMonth);
        	day=parseInt(strDay);
        	year=parseInt(strYr);
        	if (pos1==-1 || pos2==-1){
        		return false;
        	}
        	if (strMonth.length<1 || month<1 || month>12){
        		return false
        	}
        	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
        		return false
        	}
        	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
        		return false
        	}
        	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
        		return false;
        	}
            return true;    
        }
    }
	$.extend(methods);
	if (jQuery.validator) {
	    jQuery.validator.addMethod("validdate", function(value, element) {
	        return this.optional(element) || $.dateIsValid(value);
        }, "Please enter a valid date");
    }
    $.fn.collapsible = function(opts) {
		$.fn.collapsible.defaults = {
		    multi: true,
		    toggleClass: "open"
		};
		var opts = $.extend({}, $.fn.collapsible.defaults, opts);
        var frag = $.param.fragment();
		return this.each(function(idx) {
		    if (opts.multi || !frag || $(this).attr("id") != frag) $(this).removeClass("open").children(":heading:first").nextAll().hide();
		    else if ($(this).attr("id") == frag) $(this).addClass("open").children().show();
		    $(this).children(":heading:first").click(function() {
                var cEl = $(this).parent();
		        $(this).nextAll().toggle();
		        $(cEl).toggleClass(opts.toggleClass);
		        if (!opts.multi) {
		            if ($(cEl).hasClass(opts.toggleClass) && $(cEl).attr("id")) {
		                $(cEl).siblings("." + opts.toggleClass).removeClass(opts.toggleClass).children(":heading:first").siblings().hide();
                        window.location.hash = $(cEl).attr("id");
		            }
	            }
		    });   
	    });
    }
})(jQuery);