function showDiv(id) {
	
	//make array with div names
	var divArray = new Array();
	divArray[0] = "div1";
	divArray[1] = "div2";
	divArray[2] = "div3";
	
	//loop true array and set all divs to visibility = hidden
	for(i=0;i<divArray.length;i++) 
	{
		if (document.layers) document.layers[''+divArray[i]+''].visibility = "hide"
		else if (document.all) document.all[''+divArray[i]+''].style.visibility = "hidden"
		else if (document.getElementById) document.getElementById(''+divArray[i]+'').style.visibility = "hidden"
	}
	
	//put div specified by onmouseover to visible
	if (document.layers) document.layers[''+id+''].visibility = "show"
	else if (document.all) document.all[''+id+''].style.visibility = "visible"
	else if (document.getElementById) document.getElementById(''+id+'').style.visibility = "visible"
	

}