function getID(obj){
	return document.getElementById(obj);
}

String.prototype.trim = function(){
	return this.replace(/(^\s*)|(\s*$)/g, '');
}

function checkEmailFormat(obj){
	var str = obj.value.trim();
	var re = /^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
	if(!str.match(re)){
		return false;
	}else{
		return true;
	}
}

function createRequestObject(){
	var request_o; //declare the variable to hold the object.
	var browser = navigator.appName; //find the browser name
	if(browser == "Microsoft Internet Explorer"){
		/* Create the object using MSIE's method */
		request_o = new ActiveXObject("Microsoft.XMLHTTP");
	}else{
		/* Create the object using other browser's method */
		request_o = new XMLHttpRequest();
	}
	return request_o; //return the object
}

var http = createRequestObject();

function checkInteger(obj){
	if(parseInt(obj.value)){
		if(parseInt(obj.value)!=obj.value){
			obj.value = parseInt(obj.value);
		}
	}else{
		obj.value = '';
	}
}

function findPosX(obj){
	var curleft = 0;
	if (obj.offsetParent){
		while (obj.offsetParent){
			curleft += obj.offsetLeft;
			obj = obj.offsetParent;
		}
	}else if (obj.x)
		curleft += obj.x;
	return curleft;
}

function findPosY(obj){
	var curtop = 0;
	if (obj.offsetParent){
		while (obj.offsetParent){
			curtop += obj.offsetTop;
			obj = obj.offsetParent;
		}
	}else if (obj.y)
		curtop += obj.y;
	return curtop;
}

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);
}