function focustab(xTab) { 
switch(xTab){
	    case 'new':
			change_block('1');
			change_class('new');
			change_divright_class('1');
		break;
		
		case 'best':
			change_block('2');
			change_class('best');
			change_divright_class('2');
		break;
		
		case 'brand':
			change_block('3');
			change_class('brand');
			change_divright_class('3');
		break;
			
		case 'special':
			change_block('4');
			change_class('special');
			change_divright_class('4');
		break;
		
		default: 
		break;
	}

}

	function change_block(tab)
	{
		document.getElementById('block1').style.display='none';
		document.getElementById('block2').style.display='none';
		document.getElementById('block3').style.display='none';
		document.getElementById('block4').style.display='none';
		document.getElementById('block'+tab).style.display="block";
		
	}
	function change_class(tab)
	{
		document.getElementById('tab_brand').className="";
		document.getElementById('tab_best').className="";
		document.getElementById('tab_new').className="";
		document.getElementById('tab_special').className="";
	    document.getElementById('tab_'+tab).className="on";
		}
		
	function change_divright_class(tab)
	   {
		document.getElementById('divright1').className="right-off";
		document.getElementById('divright2').className="right-off";
		document.getElementById('divright3').className="right-off";
		document.getElementById('divright4').className="right-off";
		document.getElementById('divright'+tab).className="right-on";
	   }