function resetValue (tf) {
	tf.value = "";
}

function checkValue (tf,tf_text) {
	if(tf.value == "") {
		tf.value = tf_text;
	}
};
	
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 setFooter() {
	if (document.getElementById) {
		var windowHeight = getWindowHeight();
		if (windowHeight > 0) {
			var contentHeight = document.getElementById('main-content-div').offsetHeight;
			var footerElement = document.getElementById('footer');
			var footerHeight  = footerElement.offsetHeight;
					if (windowHeight - (contentHeight + footerHeight) >= 0) {
						footerElement.style.top = (windowHeight - (contentHeight + footerHeight)) + 'px';
					}
					else {
						footerElement.style.top = '0px';
					}
		}
	}
}

window.onload = function() {
	setFooter();
}

window.onresize = function() {
	setFooter();
}