function funCurrentNavItemStyleChange(inc_element_id, inc_style){
	//highlight current navigation item
	sPath = window.location.pathname;
	sPage = sPath.substring(sPath.lastIndexOf('/')+1);
	if(sPage == ""){
		sPage = "index.php";
	}
	if(document.getElementById(inc_element_id)){
		allNavItems = document.getElementById(inc_element_id).getElementsByTagName('li');
		for(i=0;i<=allNavItems.length-1;i++){
			temp_inner = allNavItems[i].innerHTML;
			if(temp_inner.lastIndexOf(sPage) > 1){
				allNavItems[i].className = inc_style;
			}else{
				allNavItems[i].className = ""; 
			}
		}
	}
}