function navigate(item)
{
	var menu = item;
	//alert(menu);
	if(menu == "cells")
	{
		document.getElementById('loadcells').style.visibility='visible';
	}else{
		document.getElementById('loadcells').style.visibility='hidden';
	}
	
	if(menu == "instruments")
	{
		document.getElementById('weighinstruments').style.visibility='visible';
	}else{
		document.getElementById('weighinstruments').style.visibility='hidden';
	}
	
	if(menu == "meters")
	{
		document.getElementById('flowmeters').style.visibility='visible';
	}else{
		document.getElementById('flowmeters').style.visibility='hidden';
	}
	
	if(menu == "")
	{
		document.getElementById('flowmeters').style.visibility='hidden';
		document.getElementById('weighinstruments').style.visibility='hidden';
		document.getElementById('loadcells').style.visibility='hidden';
	}

}