/* Author: Elsi Caldeira
       creation date: 12/21/2002
    */

    var isN4,isIE,isN6,menutimer1,menutimer2; //variables
   
	// Detected what kind of browser is 
	if (document.all) {		
        isIE = true;	
    }	
    if (document.layers) {	
        isN4 = true;	
    }	
    if (document.getElementById && !document.all) {		
        isN6 = true;	
    }
	/* function: turnOnLayer
	   parameters:  layerN-> Name of the layer to turn on
	   Description:  Turn on a layer*/
	
	function turnOnLayer(layerN) {
		clearTimeout(menutimer1);
		//clearTimeout(menutimer2);
		if (isN4) {
			
		 	eval("document.contentLayer.document." + layerN + ".visibility = 'visible'");   	   		
		}
		if (isIE) {
          	eval("document.all." + layerN + ".style.visibility= 'visible'");
        }
        if (isN6) {
          elem = document.getElementById(layerN);
          elem.style.visibility = 'visible';
		}
		
	}
	/* function: turnOffLayer
	   parameters:  layerN-> Name of the layer to turn on
	   Description:  Turn off a layer*/

    function turnOffLayer(layerN) {

		if (isN4) {
		  eval("document.contentLayer.document." + layerN + ".visibility = 'hidden'");   	   		
		}
		if (isIE) {
          eval("document.all." + layerN + ".style.visibility= 'hidden'");
        }
        if (isN6) {
          elem = document.getElementById(layerN);
          elem.style.visibility = 'hidden';
		    }
    }
    
    
    /* function: clearMenu
	   parameters:  menuN -> name of the menu layer
	   Description:  Set the timer to turn off the menu
    */
    
    function clearMenu(menuN) {
	if (menuN == "textMenu1") 
    		menutimer1 = setTimeout("turnOffLayer('textMenu1');",2000); 
	else 
    		menutimer2 = setTimeout("turnOffLayer('textMenu2');",1000);
	
    } 
    /* function: clearMenuTimer
	parameters:  menuN -> name of the menu layer
	Description:  Clear the timer to keep the menu on
    */

    function clearMenuTimer(menuN) {
	if (menuN == "textMenu1")
		clearTimeout(menutimer1);
	else
		clearTimeout(menutimer2);
    }