function ChangeTab(id, pImg, displayedimage, total, mylink)
{
	var link='';
	if(id == "0") {
		for(var i = 1; i <= 4; i++) {
			InfoButtonOff('tab'+i);
		}
	}else {	
		for(var i = 1; i <= total; i++) {
			if (i==id) {
				InfoButtonOn('tab'+i);
			}
			else {
				InfoButtonOff('tab'+i);
			}
		}
	}
	if (mylink) {
		document.getElementById(pImg).innerHTML = '<a href="' + mylink + '"><img src="' + displayedimage + '"></a>';
	} else {
		document.getElementById(pImg).innerHTML = '<img src="' + displayedimage + '"></img>';
	}
	var image = document.getElementById("mainimg");

}


function InfoButtonOn(Infobut) {
	document.getElementById(Infobut).className = "tab_on";
}
function InfoButtonOff(Infobut) {
	document.getElementById(Infobut).className = "tab_off";
}