function tab_effect(t,c){
	for(i=1;i<=3;i++){
		x="tab"+i;
		y="content"+i;
		document.getElementById(x).className="tab_off";
		document.getElementById(y).style.display="none";
		}
	document.getElementById(t).className="tab_on";
	document.getElementById(c).style.display="block";
}
function tab_effect02(t,c){
	for(i=1;i<=2;i++){
		x="tab"+i;
		y="content"+i;
		document.getElementById(x).className="tab_off";
		document.getElementById(y).style.display="none";
		}
	document.getElementById(t).className="tab_on";
	document.getElementById(c).style.display="block";
	}
function tab_effect03(t,c){
	for(i=1;i<=2;i++){
		x="tab"+i;
		y="content"+i;
		document.getElementById(x).className="tab_off";
		document.getElementById(y).style.display="none";
		}
	document.getElementById(t).className="tab_on";
	document.getElementById(c).style.display="";
	if(t=="tab1"){
		document.getElementById('img1').src="images/icon/features_red.gif";
		document.getElementById('img2').src="images/icon/profile_gray.gif";
		}
	else {
		document.getElementById('img1').src="images/icon/features_gray.gif";
		document.getElementById('img2').src="images/icon/profile_red.gif";
		}
}
function change_pic(_this,x){
	_this.src= x;
}

function change_class(_this,x){
	_this.className=x;
}