$(document).ready(function() {
	var opacity=0.5,toOpacity=1,duration=250;
	$('.inf').css('opacity',opacity).hover(function() {
		$(this).fadeTo(duration,toOpacity);
		}, function() {
			$(this).fadeTo(duration,opacity);
		}
	);
});

var cnt=document.getElementById('containterid');
if (typeof(cnt.innerText)!='undefined') {
	cnt.innerText='newtext';
}
else {
	cnt.textContent='newtext';
}

var sel=document.getElementById('selectid');
sel.options[10].setAttribute("selected","selected");

sel.options[10].selected=true;

function  getPageSize(){
	var xScroll, yScroll, pageWidth, pageHeight, windowWidth, windowHeight;
 
	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 if (document.documentElement && document.documentElement.scrollHeight > document.documentElement.offsetHeight){ // Explorer 6 strict mode
		xScroll = document.documentElement.scrollWidth;
		yScroll = document.documentElement.scrollHeight;
	} else { // Explorer Mac...would also work in Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
 
	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;
	}
 
	return [pageWidth,pageHeight,windowWidth,windowHeight];
}

<script type="text/javascript">
	var ps=getPageSize();
	if (ps[1]>ps[3]) {
		alert(">");
	}
</script>