function tb(str1, str2, str3, str4) {
	var element1 = document.getElementById(str1);
	var element2 = document.getElementById(str2);
	var element3 = document.getElementById(str3);
	var element4 = document.getElementById(str4);
			
	element1.style.display = 'block';
	element2.style.display = 'none';
	element3.style.display = 'none';
	element4.style.display = 'none';
	
	var tab1 = document.getElementById("tbtxt1");
	var tab2 = document.getElementById("tbtxt2");
	var tab3 = document.getElementById("tbtxt3");
	var tab4 = document.getElementById("tbtxt4");
	
	if(str1 == 'tb1') {
		tab1.style.backgroundImage = "url('images/tab.gif')";
		tab2.style.backgroundImage = "url('images/tab-n.gif')";
		tab3.style.backgroundImage = "url('images/tab-n.gif')";
		tab4.style.backgroundImage = "url('images/tab-n.gif')";
		document.getElementById("sel1").style.color = '#660000';
		document.getElementById("sel2").style.color = '#030303';
		document.getElementById("sel3").style.color = '#030303';
		document.getElementById("sel4").style.color = '#030303';
		tab1.style.height = 23+'px';
		tab2.style.height = 22+'px';
		tab3.style.height = 22+'px';
		tab4.style.height = 22+'px';
	}
	if(str1 == 'tb2') {
		tab2.style.backgroundImage = "url('images/tab.gif')";
		tab1.style.backgroundImage = "url('images/tab-n.gif')";
		tab3.style.backgroundImage = "url('images/tab-n.gif')";
		tab4.style.backgroundImage = "url('images/tab-n.gif')";
		document.getElementById("sel2").style.color = '#660000';
		document.getElementById("sel3").style.color = '#030303';
		document.getElementById("sel4").style.color = '#030303';
		document.getElementById("sel1").style.color = '#030303';
		tab2.style.height = 23+'px';
		tab1.style.height = 22+'px';
		tab3.style.height = 22+'px';
		tab4.style.height = 22+'px';
	}
	if(str1 == 'tb3') {
		tab3.style.backgroundImage = "url('images/tab.gif')";
		tab2.style.backgroundImage = "url('images/tab-n.gif')";
		tab1.style.backgroundImage = "url('images/tab-n.gif')";
		tab4.style.backgroundImage = "url('images/tab-n.gif')";
		document.getElementById("sel3").style.color = '#660000';
		document.getElementById("sel2").style.color = '#030303';
		document.getElementById("sel1").style.color = '#030303';
		document.getElementById("sel4").style.color = '#030303';
		tab3.style.height = 23+'px';
		tab2.style.height = 22+'px';
		tab1.style.height = 22+'px';
		tab4.style.height = 22+'px';
	}
	if(str1 == 'tb4') {
		tab4.style.backgroundImage = "url('images/tab.gif')";
		tab3.style.backgroundImage = "url('images/tab-n.gif')";
		tab2.style.backgroundImage = "url('images/tab-n.gif')";
		tab1.style.backgroundImage = "url('images/tab-n.gif')";
		document.getElementById("sel4").style.color = '#660000';
		document.getElementById("sel3").style.color = '#030303';
		document.getElementById("sel2").style.color = '#030303';
		document.getElementById("sel1").style.color = '#030303';
		tab4.style.height = 23+'px';
		tab3.style.height = 22+'px';
		tab2.style.height = 22+'px';
		tab1.style.height = 22+'px';
	}
}