function is_numeric( mixed_var ) { 
    return !isNaN( mixed_var );
}
function toggleMenuItem(catID){
	if(activeMenuItem != catID){
		document.getElementById("menuitemtitle_" + catID).className = "accordion_toggle accordion_toggle_active";
		document.getElementById("menuitemcontent_" + catID).style.height = "auto";
		document.getElementById("menuitemcontent_" + catID).style.display = "block";
		if(activeMenuItem){
			document.getElementById("menuitemtitle_" + activeMenuItem).className = "accordion_toggle";
			document.getElementById("menuitemcontent_" + activeMenuItem).style.height = "0px";
			document.getElementById("menuitemcontent_" + activeMenuItem).style.display = "none";
		}
		activeMenuItem = catID;	
	}
}
function toggleSubMenuItem(catID){
	if(activeSubMenuItem != catID){
		document.getElementById("submenuitemtitle_" + catID).className = "vertical_accordion_toggle_active";
		document.getElementById("submenuitemcontent_" + catID).style.height = "auto";
		document.getElementById("submenuitemcontent_" + catID).style.display = "block";
		if(activeMenuItem){
			document.getElementById("submenuitemtitle_" + activeSubMenuItem).className = "vertical_accordion_toggle";
			document.getElementById("submenuitemcontent_" + activeSubMenuItem).style.height = "0px";
			document.getElementById("submenuitemcontent_" + activeSubMenuItem).style.display = "none";
		}
		activeSubMenuItem = catID;	
	}
}