var Rules = {
	'#date_input': function(element, event) {
		setup_calendar(element.id, element.id);
	}
}

function setup_calendar(input, button) {
	Zapatec.Calendar.setup({
        firstDay          : 1,
        showOthers        : true,
        range             : [2008.01, 2018.12],
        electric          : false,
        inputField        : input,
        button            : button,
        ifFormat          : "%Y-%m-%d",
        daFormat          : "%Y-%m-%d"
      });
}

function getPageSize() {
	var xScroll, yScroll;
		
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		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
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			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 = xScroll;		
	} else {
		pageWidth = windowWidth;
	}

	return [pageWidth,pageHeight];
}

function getMousePosX(e) {
	var posx = 0;

	if (!e) var e = window.event;
	if (e.pageX || e.pageY) 	{
		posx = e.pageX;
		posy = e.pageY;
	}
	else if (e.clientX) 	{
		posx = e.clientX + document.body.scrollLeft
			+ document.documentElement.scrollLeft;
	}
	return posx;
}

function getMousePosY(e) {
	var posy = 0;
	if (!e) var e = window.event;
	if (e.pageY) 	{
		posy = e.pageY;
	}
	else if (e.clientY) 	{
		posy = e.clientY + document.body.scrollTop
			+ document.documentElement.scrollTop;
	}
	return posy;
}