function ValidateNumberKeyPress(field, evt)
{
	var charCode = (evt.which) ? evt.which : event.keyCode
	var keychar = String.fromCharCode(charCode);

	if (charCode > 31 && (charCode < 48 || charCode > 57) && keychar != "."  && keychar != "-" )
	{
		return false;
	}

	if (keychar == "." && field.value.indexOf(".") != -1) 
	{
		return false;
	}
		
	if(keychar == "-")
	{
		if (field.value.indexOf("-") != -1 /* || field.value[0] == "-" */) 
		{
			return false;
		}
		else
		{
			//save caret position
			var caretPos = getCaretPosition(field);
			if(caretPos != 0)
			{
				return false;
			}
		}
		return true;
	}
	
	if (window.event && (window.event.keyCode == 13 || window.event.keyCode == 3) ) {
		return calcDays();
	}

	
}

function ValidateNumberKeyUp(field)
{
	if(document.selection.type == "Text")
	{
		return;
	}

	 //save caret position
	var caretPos = getCaretPosition(field);
	
	var fdlen = field.value.length;

	UnFormatNumber(field);

	var IsFound = /^-?\d+\.{0,1}\d*$/.test(field.value);
	if(!IsFound)
	{
		setSelectionRange(field, caretPos, caretPos);
		return false;             
	}
	
	field.value = FormatNumber(field.value);
	
	fdlen = field.value.length - fdlen;

	
	setSelectionRange(field, caretPos+fdlen, caretPos+fdlen);
}

function ValidateAndFormatNumber(NumberTextBox)
{
	if(NumberTextBox.value == "") return;
	
	UnFormatNumber(NumberTextBox);

	var IsFound = /^-?\d+\.{0,1}\d*$/.test(NumberTextBox.value);
	if(!IsFound)
	{
		alert("Not a number");
		NumberTextBox.focus();
		NumberTextBox.select();  
		return;             
	}
	
	if(isNaN(parseFloat(NumberTextBox.value)))
	{
		alert("Number exceeding float range");
		NumberTextBox.focus();
		NumberTextBox.select();               
	}

	NumberTextBox.value = FormatNumber(NumberTextBox.value);
}

function FormatNumber(fnum)
{
	var orgfnum = fnum;
	var flagneg = false;
	
	if(fnum.charAt(0) == "-")
	{
		flagneg = true;
		fnum = fnum.substr(1, fnum.length-1);
	}
	
	psplit = fnum.split(".");

	var cnum = psplit[0],
		parr = [],
		j = cnum.length,
		m = Math.floor(j / 3),
		n = cnum.length % 3 || 3;

	// break the number into chunks of 3 digits; first chunk may be less than 3
	for (var i = 0; i < j; i += n) {
		if (i != 0) {n = 3;}
		parr[parr.length] = cnum.substr(i, n);
		m -= 1;
	}

	// put chunks back together, separated by comma
	fnum = parr.join(",");

	// add the precision back in
	//if (psplit[1]) {fnum += "." + psplit[1];}
	if (orgfnum.indexOf(".") != -1)  
	{
		fnum += "." + psplit[1];
	}
	
	if(flagneg == true)
	{
		fnum = "-" + fnum;
	}
	
	return fnum;
}
   
function UnFormatNumber(obj)
{
	if(obj.value == "") return;
	
	obj.value = obj.value.replace(/,/gi, "");
}

function getCaretPosition(objTextBox){

	var objTextBox = window.event.srcElement;

	var i = objTextBox.value.length;

	if (objTextBox.createTextRange){
		objCaret = document.selection.createRange().duplicate();
		while (objCaret.parentElement()==objTextBox &&
		  objCaret.move("character",1)==1) --i;
	}
	return i;
}

function setSelectionRange(input, selectionStart, selectionEnd) {
	if (input.setSelectionRange) {
		input.focus();
		input.setSelectionRange(selectionStart, selectionEnd);
	}
	else if (input.createTextRange) {
		var range = input.createTextRange();
		range.collapse(true);
		range.moveEnd('character', selectionEnd);
		range.moveStart('character', selectionStart);
		range.select();
	}
}