// detector de browser
function aparece(){
    var dom = document.getElementById ? true:false;//nn6
    var nn4 = document.layers ? true:false;
    var ie4 = document.all ? true:false;
	
	for (i = 1; i <= maxNumOfScrolls; i++) {
    	if(ie4){
    		if (!document.all["content"+i]) continue;	// Si no está definido el scroll, no hace nada
			// Si no es necesario que no aparezca, no lo muestra
			if (document.all["content"+i].clientHeight > document.all["contentClip"+i].clientHeight){
    			document.all["fondo"+i].style.visibility="visible";
    			document.all["up"+i].style.visibility="visible";
    			document.all["down"+i].style.visibility="visible";
    			document.all["drag"+i].style.visibility="visible";
    			document.all["ruler"+i].style.visibility="visible";
	   		}
    	}
    
    	else if(nn4){
    		if (!document.layers['fondo'+i]) continue;
    		if (document.contentClip.document.content.clip.height > 187){
    			document.layers['fondo'+i].visibility="visible";
    			document.layers['up'+i].visibility="visible";
    			document.layers['down'+i].visibility="visible";
    			document.layers['drag'+i].visibility="visible";
    			document.layers['ruler'+i].visibility="visible";
    		}
    	}
    
    	else if(dom){
    		if (!document.getElementById("content"+i)) continue;
    		if (document.getElementById('content'+i).offsetHeight > document.getElementById('contentClip'+i).offsetHeight){
    			document.getElementById('fondo'+i).style.visibility = "visible";
    			document.getElementById('up'+i).style.visibility = "visible";
    			document.getElementById('down'+i).style.visibility = "visible";
    			document.getElementById('drag'+i).style.visibility = "visible";
    			document.getElementById('ruler'+i).style.visibility = "visible";
    		}
    	}
	}
}