function showFun(){
     var rand = Math.floor(Math.random()*15); 
     var theDiv= "factstext" + rand;
//     alert(theDiv);
     document.getElementById(theDiv).style.display="block";
}

function showNext() {
	for (i = 0; i <= 14; i++) {
		var theDiv = "factstext" + i;
		if(document.getElementById(theDiv).style.display == "block") {
			document.getElementById(theDiv).style.display = "none";
			var j = i + 1;
			if (j > 14) j = 0;
			var nextDiv = "factstext" + j;
			document.getElementById(nextDiv).style.display = "block";
			break;
		}
	}
}