// JavaScript Document

function showhide() {
  if (document.getElementById("mydiv").className = "divHide") {
    document.getElementById("mydiv").className = "divShow";
  } else {
    document.getElementById("mydiv").className = "divHide";
  }
}
 
<!--
//var state = 'none';
var state = 'block';
 
function showhide(layer_ref,read) {
 
	
/*	if (state == 'block') {
		state = 'none';
	}
	else {
		state = 'block';
	}*/
 
	if (document.all) { //IS IE 4 or 5 (or 6 beta)
		eval( "document.all." + layer_ref + ".style.display = 'block'");
		eval( "document.all." + read + ".style.display = 'none'");
		
	}// End of IS IE 4 or 5 (or 6 beta)
	
	if (document.layers) { //IS NETSCAPE 4 or below
		document.layers[layer_ref].display = state;
		document.layers[read].display = 'none';
	} //End of IS NETSCAPE 4 or below
	
	if (document.getElementById && !document.all) {
		maxwell_smart = document.getElementById(layer_ref);
		maxwell_smart.style.display = state;
		
		read_smart = document.getElementById(read);
		read_smart.style.display = 'none';
	}	
 
}// End of  function
//-->