var switchElements = new Array('sb1','sb2','sb3');
var switchClasses = ['current', ''];

function switch1(el) {
    var elm = document.getElementById(el); 
    
    for(var i=0;i<switchElements.length;i++) {
        var el = document.getElementById(switchElements[i]);
        el.className = switchClasses[1];
	}
    elm.className = switchClasses[0];
    return false;
}