function nav(idd){
	if (idd == 1 ){	
		document.getElementById('two').className='liHidden'
		document.getElementById('three').className='liHidden';		
		document.getElementById('one').className='';
	}
	else if (idd == 2 ){
		document.getElementById('one').className='liHidden';
		document.getElementById('three').className='liHidden';		
		document.getElementById('two').className='';
	}
	else if (idd == 3 ){
		document.getElementById('one').className='liHidden';
		document.getElementById('three').className='';
		document.getElementById('two').className='liHidden';
	}/* If Condition Ends here */
}