/*
This function can be used to add unlimited window.onload events.
*/
function addLoadEvent(func) {
    var oldonload = window.onload;
        if (typeof window.onload != 'function') {
            window.onload = func;
        } else {
            window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}

/*
This function is used to disable the form to help prevent 
double submits.

Usage: 
<form onsubmit="submitAndDisableForm(this);return void;">
*/
function submitAndDisableForm(form)
{
    form.submit();
    var elements = form.elements();
    for(var i=0;i<elements.length;i++) {
        elements[i].disabled=true;
    }
}

/*
This function can be used to disable the "Enter" key for 
stricter control over forms.
Usage:
document.onkeypress = disableEnterKey;
*/
function disableEnterKey(e)
{
     var key;
     if(window.event)
          key = window.event.keyCode;     //IE
     else
          key = e.which;     //firefox

     if(key == 13)
          return false;
     else
          return true;
}

function number_format( number, decimals, dec_point, thousands_sep ) {
	var n = number, c = isNaN(decimals = Math.abs(decimals)) ? 2 : decimals;
	var d = dec_point == undefined ? "." : dec_point;
	var t = thousands_sep == undefined ? "," : thousands_sep, s = n < 0 ? "-" : "";
	var i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", j = (j = i.length) > 3 ? j % 3 : 0;

	return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
}

function moveOnMax(field, nextFieldId)
{
    //alert(field.value.length+':'+field.maxlength);
	if(field.value.length >= field.maxlength) {
		document.getElementById(nextFieldId).focus();
	}   
}

function addCommas(nStr)
{
	nStr += ''; 
	x = nStr.split('.');
	x1 = x[0];
	x2 = x.length > 1 ? '.' + x[1] : ''; 
	var rgx = /(\d+)(\d{3})/;
	while (rgx.test(x1)) {
		x1 = x1.replace(rgx, '$1' + ',' + '$2');
	}   
	return x1 + x2; 
}

CharacterLimit = function(limit, field, track)
{
	this.limit = limit;
	this.field = field;
	this.track = track || false;

	var tmp = this;
	this.field.onkeyup = function() { tmp.update(); }

	this.update = function() {
		if(this.field.value.length > this.limit) {
			this.field.value = this.field.value.substring(0, this.limit);
			alert('Character limit has been reached.');
		}

		if(this.track) {
			this.track.innerHTML = '' + this.limit - this.field.value.length;
		}
	}
}