function zoomText( Tamano, Elemento ){
	//inicializacion de variables y parámetros
	var obj = document.getElementById( Elemento );
	obj.style.fontSize = Tamano + "px";
}

function Show( id ){
	obj = document.getElementById( id );
	obj.style.display = 'block';
}

function Hide( id ){
	obj = document.getElementById( id );
	obj.style.display = 'none';
}

function ClearDivs( id, preffix, qty ){
	var obj = document.getElementById( id );
	
	for( i = 1; i <= qty; i++ ){
		document.getElementById( preffix + i ).style.display = 'none';
	}
	
	obj.style.display = 'block'	;
}

function ShowAndHide( id ){
	obj = document.getElementById(id);
	
	if( obj.style.display == 'none' ){
		obj.style.display = 'block';
	}else{
		obj.style.display = 'none';
	}
}

function addClass( id, c ){
	obj = document.getElementById( id );
	obj.className += ' ' + c;
}

function removeClass( id, c ){
	obj = document.getElementById( id );
	var str = obj.className;
	obj.className = str.replace( c, "" );
}

function changeCity( index ){
	var Show = "c" + index;
	ClearDivs( Show, 'c', 17 );
}