function validate_email(dv,alerttxt)  // e-mail validation
{
	if((dv.indexOf(':', 0) >= 0) || (dv.indexOf(';', 0) >= 0) ||(dv.indexOf('<', 0) >= 0) ||(dv.indexOf('>', 0) >= 0) ||(dv.indexOf('\\', 0) >= 0) ||(dv.indexOf(',', 0) >= 0) ||(dv.indexOf(' ', 0) >= 0) ||(dv.indexOf('/', 0) >= 0) ||(dv.indexOf('@', 0) == -1) || (dv.indexOf('.', 0) == -1)) 
	{alert(alerttxt);
		return false;
	}
	
	apos=dv.indexOf("@")
	dotpos=dv.lastIndexOf(".")

	if (apos<1||dotpos-apos<2) 
	  {alert(alerttxt);
								//alert("Second If");
	  return false;}
	
	apos2=dv.lastIndexOf("@")
	if (apos !=apos2) 
	  {
		  alert(alerttxt);
								//alert("Third If");
		  return false;
		  }
	else {return true}
}

function blockNonNumbers(obj,e, allowDecimal, allowNegative)// for numeric validation
{
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);
}//end function

function extractNumber(obj, decimalPlaces, allowNegative)// extrack non-numeric character
{ 
	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;
}