/**
Function to calculate window height

@return windowHeight	Integer window height
*/
function getWindowHeight() {
	var windowHeight = 0;
	if (typeof(window.innerHeight) == 'number') {
		windowHeight = window.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight) {
		windowHeight = document.documentElement.clientHeight;
	}
	else if (document.body && document.body.clientHeight) {
		windowHeight = document.body.clientHeight;
	}
	return windowHeight;
}
/**
Function to calculate window width

@return windowWidth	Integer window height
*/
function getWindowWidth() {
	var windowWidth = 0;
	if (typeof(window.innerWidth) == 'number') {
		windowWidth = window.innerWidth;
	}
	else if (document.documentElement && document.documentElement.clientWidth) {
		windowWidth = document.documentElement.clientWidth;
	}
	else if (document.body && document.body.clientWidth) {
		windowWidth = document.body.clientWidth;
	}
	return windowWidth;
}

/**
Function to position footer block on page using CSS and W3C DOM
*/
function setFooter() {
	if (document.getElementById) {
		var windowHeight = getWindowHeight();
		if (windowHeight > 0) {
			var contentHeight = document.getElementById('content').offsetHeight;
			var footerElement = document.getElementById('footer');
			var footerHeight  = footerElement.offsetHeight;
			if (windowHeight - (contentHeight + footerHeight) >= 0) {
				footerElement.style.position = 'relative';
				footerElement.style.top = (windowHeight - (contentHeight + footerHeight)) + 'px';
			}
			else {
				footerElement.style.position = 'static';
			}
		}
	}
}
function setMenuImage() {
	var imgNo = parseInt(Math.floor((Math.random() * 6)) + 1, 10);
	document.getElementById('menuImage').src = 'images/general/menu' + imgNo + '.jpg';
	document.getElementById('menuImage').className = 'noprint';
}
window.onload = function() {
	setFooter();
	setMenuImage();
	onLoadFunction();
	handleOnSubmit();
}
window.onresize = function() {
	setFooter();
}

/**
Function to add preventDoubleClick() call to the existing onsubmit event handler
*/
function handleOnSubmit(){
	var theForm = document.forms[0];
	if(!theForm){return;}
	if(theForm.onsubmit){
		var fOriginalSubmit=theForm.onsubmit;
		fOriginalSubmit=(fOriginalSubmit.toString()).replace(/this/,'document.forms[0]');
		//alert(fOriginalSubmit);
		//theForm.onsubmit=new Function("if("+fOriginalSubmit+"()==true){return preventDoubleClick();}else{return false;}");
		theForm.onsubmit=new Function("return ( "+fOriginalSubmit+"() && preventDoubleClick() );");
	}else{
		theForm.onsubmit=new Function("return preventDoubleClick();");
	}
}

/**
Function to prevent double click
*/
var DOUBLE_CLICK_COUNTER=0;
var CLICK_TIME=0;
var NUMBER_OF_SECONDS_TO_WAIT=5;
var DOUBLE_CLICK_ALERT_MESSAGE="This form has already been submitted\nPlease wait..."; //will be translated


function preventDoubleClick(){
	if(CLICK_TIME == 0){
		var tDate = new Date;
		CLICK_TIME = tDate.valueOf();
	}
	DOUBLE_CLICK_COUNTER++;
	var trapTheClick = false;

	if(DOUBLE_CLICK_COUNTER > 1 ) {
		trapTheClick = true; 
		var tDate = new Date;
		var secondClickTime = tDate.valueOf();
		//alert('DOUBLE_CLICK_COUNTER='+DOUBLE_CLICK_COUNTER+'; CLICK_TIME='+CLICK_TIME+'; secondClickTime='+secondClickTime+'; diff='+(secondClickTime - CLICK_TIME));
		if((secondClickTime - CLICK_TIME) > (NUMBER_OF_SECONDS_TO_WAIT * 1000)) {
			CLICK_TIME = 0;
			trapTheClick = false;
			DOUBLE_CLICK_COUNTER = 0;
		}
	}

	var valueToReturn = true;
	if(trapTheClick == true) {
		valueToReturn = false;
		alert(DOUBLE_CLICK_ALERT_MESSAGE);
	}
	
	return valueToReturn;
}