function isObject(a) 
{
	return (typeof a == 'object' && !!a) || isFunction(a);
}

function isDigit(num) {
	if (num.length>1){return false;}
	var string="1234567890";
	if (string.indexOf(num)!=-1){return true;}
	return false;
	}

function isBlank(val){
	if(val==null){return true;}
	for(var i=0;i<val.length;i++) {
		if ((val.charAt(i)!=' ')&&(val.charAt(i)!="\t")&&(val.charAt(i)!="\n")&&(val.charAt(i)!="\r")){return false;}
		}
	return true;
	}

function isInteger(val)
{
	if (isBlank(val)){return false;}
	for(var i=0;i<val.length;i++){
		if(!isDigit(val.charAt(i))){return false;}
		}
	return true;
}

function DateCheck(from, to)
{
if (Date.parse(from) <= Date.parse(to)) {
	return true;	
}
else 
{
	return false;
}
}

function isKeyboardCharacters(val)
{
if (val.match(/^[a-zA-Z0-9~!@#$%^&*()_+`\-={}|\[\]\\:";'<>?,./ ]+$/))
{
return true;
}
else
{
return false;
} 
}

function popup(mylink, windowname)
{
if (! window.focus)return true;
var href;
if (typeof(mylink) == 'string')
   href=mylink;
else
   href=mylink.href;
window.open(href, windowname, 'width=800,height=600,left=50,top=50,scrollbars=yes');
return false;
}

function targetopener(mylink, closeme, closeonly)
{
if(typeof window.opener == 'undefined')
{
	window.close();
}
if(typeof window.opener != 'undefined' && window.opener.closed){
	window.close();
	return false;
}

if (! (window.focus && window.opener))return true;
window.opener.focus();
if (! closeonly)window.opener.location.href=mylink.href;
if (closeme)window.close();
return false;
}

function extractNumber(obj, decimalPlaces, allowNegative)
{
	var temp = obj.value;
	
	// avoid changing things if already formatted correctly
	var reg0Str = '[0-9]*';
	if (decimalPlaces > 0) {
		reg0Str += '\\.?[0-9]{0,' + decimalPlaces + '}';
	} else if (decimalPlaces < 0) {
		reg0Str += '\\.?[0-9]*';
	}
	reg0Str = allowNegative ? '^-?' + reg0Str : '^' + reg0Str;
	reg0Str = reg0Str + '$';
	var reg0 = new RegExp(reg0Str);
	if (reg0.test(temp)) return true;

	// first replace all non numbers
	var reg1Str = '[^0-9' + (decimalPlaces != 0 ? '.' : '') + (allowNegative ? '-' : '') + ']';
	var reg1 = new RegExp(reg1Str, 'g');
	temp = temp.replace(reg1, '');

	if (allowNegative) {
		// replace extra negative
		var hasNegative = temp.length > 0 && temp.charAt(0) == '-';
		var reg2 = /-/g;
		temp = temp.replace(reg2, '');
		if (hasNegative) temp = '-' + temp;
	}
	
	if (decimalPlaces != 0) {
		var reg3 = /\./g;
		var reg3Array = reg3.exec(temp);
		if (reg3Array != null) {
			// keep only first occurrence of .
			//  and the number of places specified by decimalPlaces or the entire string if decimalPlaces < 0
			var reg3Right = temp.substring(reg3Array.index + reg3Array[0].length);
			reg3Right = reg3Right.replace(reg3, '');
			reg3Right = decimalPlaces > 0 ? reg3Right.substring(0, decimalPlaces) : reg3Right;
			temp = temp.substring(0,reg3Array.index) + '.' + reg3Right;
		}
	}
	
	obj.value = temp;
}
function blockNonNumbers(obj, e, allowDecimal, allowNegative)
{
	var key;
	var isCtrl = false;
	var keychar;
	var reg;
		
	if(window.event) {
		key = e.keyCode;
		isCtrl = window.event.ctrlKey
	}
	else if(e.which) {
		key = e.which;
		isCtrl = e.ctrlKey;
	}
	
	if (isNaN(key)) return true;
	
	keychar = String.fromCharCode(key);
	
	// check for backspace or delete, or if Ctrl was pressed
	if (key == 8 || isCtrl)
	{
		return true;
	}

	reg = /\d/;
	var isFirstN = allowNegative ? keychar == '-' && obj.value.indexOf('-') == -1 : false;
	var isFirstD = allowDecimal ? keychar == '.' && obj.value.indexOf('.') == -1 : false;
	
	return isFirstN || isFirstD || reg.test(keychar);
}

function getDaysInMonth(aDate){
   // returns the last day of a given month
    var m = new Number(aDate.getMonth());
    var y = new Number(aDate.getYear());

    var tmpDate = new Date(y, m, 28);
    var checkMonth = tmpDate.getMonth();
    var lastDay = 27;

    while(lastDay <= 31){
        temp = tmpDate.setDate(lastDay + 1);
        if(checkMonth != tmpDate.getMonth())
            break;
        lastDay++
    }
    return lastDay;
}

function dateFormat(aDate, displayPat){
    /********************************************************
    *   Valid Masks:
    *   !mmmm = Long month (eg. January)
    *   !mmm = Short month (eg. Jan)
    *   !mm = Numeric date (eg. 07)
    *   !m = Numeric date (eg. 7)
    *   !dddd = Long day (eg. Monday)
    *   !ddd = Short day (eg. Mon)
    *   !dd = Numeric day (eg. 07)
    *   !d = Numeric day (eg. 7)
    *   !yyyy = Year (eg. 1999)
    *   !yy = Year (eg. 99)
   ********************************************************/

    intMonth = aDate.getMonth();
    intDate = aDate.getDate();
    intDay = aDate.getDay();
    intYear = aDate.getFullYear();

    var months_long =  new Array ('January','February','March','April',
       'May','June','July','August','September','October','November','December')
    var months_short = new Array('Jan','Feb','Mar','Apr','May','Jun',
       'Jul','Aug','Sep','Oct','Nov','Dec')
    var days_long = new Array('Sunday','Monday','Tuesday','Wednesday',
       'Thursday','Friday','Saturday')
    var days_short = new Array('Sun','Mon','Tue','Wed','Thu','Fri','Sat')

    var mmmm = months_long[intMonth]
    var mmm = months_short[intMonth]
    var mm = intMonth < 9?'0'+ (1 + intMonth) + '':(1+intMonth)+'';
    var m = 1+intMonth+'';
    var dddd = days_long[intDay];
    var ddd = days_short[intDay];
    var dd = intDate<10?'0'+intDate+'':intDate+'';
    var d = intDate+'';
    var yyyy = intYear;

    century = 0;
    while((intYear-century)>=100)
        century = century + 100;

    var yy = intYear - century
    if(yy<10)
        yy = '0' + yy + '';

    displayDate = new String(displayPat);

    displayDate = displayDate.replace(/!mmmm/i,mmmm);
    displayDate = displayDate.replace(/!mmm/i,mmm);
    displayDate = displayDate.replace(/!mm/i,mm);
    displayDate = displayDate.replace(/!m/i,m);
    displayDate = displayDate.replace(/!dddd/i,dddd);
    displayDate = displayDate.replace(/!ddd/i,ddd);
    displayDate = displayDate.replace(/!dd/i,dd);
    displayDate = displayDate.replace(/!d/i,d);
    displayDate = displayDate.replace(/!yyyy/i,yyyy);
    displayDate = displayDate.replace(/!yy/i,yy);

    return displayDate;
}

function isWeekEnd(date){
	return dateFormat(new Date(date), '!ddd') == 'Sat' || dateFormat(new Date(date), '!ddd') == 'Sun'
}