function FileName(evt) {
// solo permite letras comunes (minusculas), números, y el símbolo "_"
	var Valid=false,Cont=48;
	if(evt.charCode==95) { Valid=true; }
	if(evt.keyCode==9) { Valid=true; }
	if(evt.keyCode==8) { Valid=true; }
	if(evt.keyCode==46) { Valid=true; }
	if(evt.keyCode==37) { Valid=true; }
	if(evt.keyCode==39) { Valid=true; }
	while(Cont<58 && !Valid) {
		if(evt.charCode==Cont) { Valid=true; }
		Cont++;
	}
	Cont=65;
	while(Cont<91 && !Valid) {
		if(evt.charCode==Cont) { Valid=true; }
		Cont++;
	}
	Cont=97;
	while(Cont<123 && !Valid) {
		if(evt.charCode==Cont) { Valid=true; }
		Cont++;
	}
	return Valid;
}

function Numeric(evt) {
// solo permite números
	var Valid=false,Cont=48;
	if(evt.keyCode==9) { Valid=true; }
	if(evt.keyCode==8) { Valid=true; }
	if(evt.keyCode==46) { Valid=true; }
	if(evt.keyCode==37) { Valid=true; }
	if(evt.keyCode==39) { Valid=true; }
	while(Cont<58 && !Valid) {
		if(evt.charCode==Cont) { Valid=true; }
		Cont++;
	}
	return Valid;
}

function SetMenu(ID,Screen) {
	document.getElementById("bNews").style.backgroundImage="";
	document.getElementById("bAboutus").style.backgroundImage="";
	document.getElementById("bGallery").style.backgroundImage="";
	document.getElementById("bHowtocome").style.backgroundImage="";
	document.getElementById("bContactus").style.backgroundImage="";
	document.getElementById("bNews").style.color="";
	document.getElementById("bAboutus").style.color="";
	document.getElementById("bGallery").style.color="";
	document.getElementById("bHowtocome").style.color="";
	document.getElementById("bContactus").style.color="";
	document.getElementById("bNews").style.cursor="";
	document.getElementById("bAboutus").style.cursor="";
	document.getElementById("bGallery").style.cursor="";
	document.getElementById("bHowtocome").style.cursor="";
	document.getElementById("bContactus").style.cursor="";
	document.getElementById("bNews").style.marginLeft="";
	document.getElementById("bAboutus").style.marginLeft="";
	document.getElementById("bGallery").style.marginLeft="";
	document.getElementById("bHowtocome").style.marginLeft="";
	document.getElementById("bContactus").style.marginLeft="";
	var Exec='document.getElementById("'+ID+'").style.marginLeft="-4px";';
	setTimeout(Exec,1);
	Exec='document.getElementById("'+ID+'").style.marginLeft="-8px";';
	setTimeout(Exec,50);
	Exec='document.getElementById("'+ID+'").style.marginLeft="-12px";';
	setTimeout(Exec,100);
	Exec='document.getElementById("'+ID+'").style.marginLeft="-8px";';
	setTimeout(Exec,150);
	Exec='document.getElementById("'+ID+'").style.marginLeft="-4px";';
	setTimeout(Exec,200);
	Exec='document.getElementById("'+ID+'").style.marginLeft="";';
	Exec+='document.getElementById("'+ID+'").style.backgroundImage=';
	Exec+="'url("+'"../img/sider_button_off.png"'+")';";
	Exec+='document.getElementById("'+ID+'").style.color="#abc";';
	Exec+='document.getElementById("'+ID+'").style.cursor="default";';
	if(Screen=="lite") { Exec+='document.getElementById("sider").style.display="none";'; }
	setTimeout(Exec,250);
}

function DisplayMenu() {
	if(document.getElementById("sider").style.display=="block") {
		document.getElementById("sider").style.display="none";
	} else { document.getElementById("sider").style.display="block"; }
}