// -----------------------------------------------------------------------------------

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
// Code by Lokesh Dhakar
function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}

// -----------------------------------------------------------------------------------

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Code by Lokesh Dhakar
// Edit for Firefox by pHaez
//
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

// -----------------------------------------------------------------------------------

//
// is_ie()
// Returns IE version or false.
// Code by xuxu
function is_ie() {
	if (navigator.appName == 'Microsoft Internet Explorer') {
		var reg_exp = new RegExp('MSIE [0-9]*.[0-9]*', 'gi');
		var str = new String(navigator.appVersion);
		var result = new String(str.match(reg_exp));
		var array_version = result.split(' ');
		var version = array_version[1];

		return version;
	}
	else {
		return false;
	}
}

// -----------------------------------------------------------------------------------

//
// addEvent()
// 
// Code from quirksmode.org
function addEvent(obj, evType, fn, useCapture){
	if (obj.addEventListener) {
		obj.addEventListener(evType, fn, useCapture);
		return true;
	}
	else if (obj.attachEvent){
		var r = obj.attachEvent("on"+evType, fn);
		return r;
	}
	else {
		alert("Handler could not be attached");
	}
}

// -----------------------------------------------------------------------------------

//
// is_blank_value()
// Return false if value empty
// Code by xuxu
function is_blank_value(val) {
	var str = new String(val);
	str = str.replace(/\n/gi, '');
	if (str.match('^[ ]{1,}$')) { return true; } else { return false; }
}

// -----------------------------------------------------------------------------------

//
// is_empty_value()
// Return false is value incorrect
// Code by xuxu
function is_empty_value(val) {
	if (val == '' || is_blank_value(val)) { return true; } else { return false; }
}

// -----------------------------------------------------------------------------------

//
// is_email_valid()
// Return if the email value is correct
// Code by xuxu
function is_email_valid(val) {
	var str = new String(val);
	if (!str.match('^[-_\.0-9a-zA-Z]{1,}@[-_\.0-9a-zA-Z]{1,}[\.][0-9a-zA-Z]{2,}$')) { return false;	} else { return true; }
}