function focusTab(param) {

	var sNewImage = "url(images/images" + param + ".gif) no-repeat";
	document.getElementById("TabDisplayArea").style.background = sNewImage;

	var sID = "MainTabContent" + param;	
	var dNode = document.getElementById(sID);
	dNode.style.display = "block";	

	for (var i = 1; i < 4; i++) {
		if (param != i) {
    	  var sTID = "MainTabContent" + i;
		  var tNode = document.getElementById(sTID);
		  tNode.style.display = "none";	  
		}
	}
	
}

function init(param) {

	var urlhash = window.location.href;
	if (urlhash) {
		var regex = /\?topic=(\w+)/;
		if (regex.test(urlhash)) {
			var subject = RegExp.$1;
			if (subject.toLowerCase() == "Science".toLowerCase()) {
				param = 1;
			}
			else if (subject.toLowerCase() == "Mathematics".toLowerCase()) {
				param = 2;
			} else if (subject.toLowerCase() == "VedicMathematics".toLowerCase()) {
				param = 3;
			}
		} 
	}
	
	var sID = "MainTabContent" + param;	
	var dNode = document.getElementById(sID);
	dNode.style.display = "block";

	var sNewImage = "url(images/images" + param + ".gif) no-repeat";
	document.getElementById("TabDisplayArea").style.background = sNewImage;

}