function btn_mouseOverOut(btn_name, btn_class) {	
	document.getElementById(btn_name).className = btn_class;
}

function btn_click(btn_name, btn_class) {
	
	for ( var i = 0; i <= 6; i++ ) {
			eval("document.getElementById('tab" + i + "').className = 'hideObjExp';");
		} 	
	document.getElementById(btn_name).className = btn_class;
	document.getElementById('btn1').className = 'tabSelected';
}