//Declarando variables:

var zoomName;
var zoom;
var number = 1;

//Declaración de variables de imagen con dirección de la imagen:

if (document.images) {
  zoom1		= new Image(455,455); zoom1.src = "images/guia-croquis/guiacroquis1.gif";
  zoom2		= new Image(455,455); zoom2.src = "images/guia-croquis/guiacroquis2.gif";
  zoom3		= new Image(455,455); zoom3.src = "images/guia-croquis/guiacroquis3.gif";
  zoom4		= new Image(455,455); zoom4.src = "images/guia-croquis/guiacroquis4.gif";
  zoom5		= new Image(455,455); zoom5.src = "images/guia-croquis/guiacroquis5.gif";
  zoom6		= new Image(455,455); zoom6.src = "images/guia-croquis/guiacroquis6.gif";
  zoom7		= new Image(455,455); zoom7.src = "images/guia-croquis/guiacroquis7.gif";
  zoom8		= new Image(455,455); zoom8.src = "images/guia-croquis/guiacroquis8.gif";
  zoom9		= new Image(455,455); zoom9.src = "images/guia-croquis/guiacroquis9.gif";
  zoom10		= new Image(455,455); zoom10.src = "images/guia-croquis/guiacroquis10.gif";
  zoom11		= new Image(455,455); zoom11.src = "images/guia-croquis/guiacroquis11.gif";
  zoom12		= new Image(455,455); zoom12.src = "images/guia-croquis/guiacroquis12.gif";
}

function zoom( num ) {
	if (num == 0) {
		number = number + 1;
		if ( number >= 13) {
			number = 12;
		}
		else {
			if ( document.images ) {
				document.images[ "mapzoom" ].src = eval( "zoom" + number + ".src" );
			}
		}
	}
	else {
		if (num == 1) {
			number = number - 1;
			if ( number <= 0) {
				number = 1;
			}
			else {
				if ( document.images ) {
					document.images[ "mapzoom" ].src = eval( "zoom" + number + ".src" );
				}
			}
		}
	}
}