var state_content = "tab1_content";
var state_on = "tab1_on";
var state_off = "tab1_off";

function switchTab(tab){
	
	if(document.getElementById) {
		document.getElementById(state_on).style.display = "none";
		document.getElementById(state_off).style.display = "block";
		document.getElementById(state_content).style.display = "none";
	}
	state_content = tab+"_content";
	state_on = tab+"_on";
	state_off = tab+"_off";
	
	if(document.getElementById) {
		document.getElementById(state_on).style.display = "block";
		document.getElementById(state_off).style.display = "none";
		document.getElementById(state_content).style.display = "block";
	}
}