// JavaScript Document

	var subMenuOn = false;
	var cancelHide = false;
	var effectOn = false;

	function navOn(n) {
		
		if (n == "manufacturers") {
			showSubMenu();
		} 
		else {
			document.images[n].src = "imgs/"+n+"_1.gif";
		}
	}
	
	function navOff(n) {
		document.images[n].src = "imgs/"+n+"_0.gif";
	
		if (subMenuOn) hideSubMenu();
	
	}	
	
	
	function showSubMenu() {		
		if (subMenuOn == 1) return true;
		
		if (document.images['manufacturers']) document.images['manufacturers'].src = "imgs/manufacturers_1.gif";
		var obj = document.getElementById("m_submenu");
		obj.style.visibility = "visible";
		if (!effectOn) {
			//opacity("manu_submenu", 0, 100, 500);
			effectOn = true;
		}
		subMenuOn = 1;
	}
	
	function hideSubMenu() {
		var obj = document.getElementById("m_submenu");
		obj.style.visibility = "hidden";
		if (document.images['manufacturers']) document.images['manufacturers'].src = "imgs/manufacturers_0.gif";
		subMenuOn = 0;
		effectOn = false;
	}
	
	//////////////////////////////////////////////
	
	function opacity(id, opacStart, opacEnd, millisec) {
    	//speed for each frame
    	var speed = Math.round(millisec / 100);
    	var timer = 0;

    	//determine the direction for the blending, if start and end are the same nothing happens
    	if(opacStart > opacEnd) {
        	for(i = opacStart; i >= opacEnd; i--) {
            	setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            	timer++;
        	}
    	} else if(opacStart < opacEnd) {
        	for(i = opacStart; i <= opacEnd; i++)
            {
            	setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            	timer++;
       		 }
	    }
	} 
	
	
	//change the opacity for different browsers
	function changeOpac(opacity, id) {
    	var object = document.getElementById(id).style;
	    object.opacity = (opacity / 100);
	    object.MozOpacity = (opacity / 100);
	    object.KhtmlOpacity = (opacity / 100);
	    object.filter = "alpha(opacity=" + opacity + ")";
	}