function positionBG(){
	if(document.height){
		//NOTE:this is an arbitrary "margin of error"
		if((document.height+150) < window.screen.availHeight){	
			document.documentElement.style.height = "100%";
			document.body.style.height = "100%";
			document.body.style.overflow = "hidden";
		} else {
			document.documentElement.style.height = "auto";
			document.body.style.height = "auto";
			document.body.style.overflow = "auto";
		}
	}
	document.body.className = "clouds";	//NOTE: site-specific
}