var classTab = new Array("ac","in","re","3d","sp");

function tabMenu(num){
	document.getElementById(classTab[num]+'_tab').style.display="block";
	for (i=0;i<5;i++){
		if(i==num){
			continue;
		}
		document.getElementById(classTab[i]+'_tab').style.display="none";
		}
		return false;
}