if (document.images) {
flecha = new Image(); flecha.src = "images/flecha.gif"
flecha_over = new Image(); flecha_over.src = "images/flecha_over.gif"
filtrar_off = new Image(); filtrar_off.src = "images/filtrar_off.gif"
filtrar_over = new Image(); filtrar_over.src = "images/filtrar_over.gif"
salir_off = new Image(); salir_off.src = "images/salir_off.gif"
salir_over = new Image(); salir_over.src = "images/salir_over.gif"
ingresar_off = new Image(); ingresar_off.src = "images/ingresar_off.gif"
ingresar_over = new Image(); ingresar_over.src = "images/ingresar_over.gif"
resetear_off = new Image(); resetear_off.src = "images/resetear_off.gif"
resetear_over = new Image(); resetear_over.src = "images/resetear_over.gif"
ejecutar_off = new Image(); ejecutar_off.src = "images/filtro_off.gif"
ejecutar_over = new Image(); ejecutar_over.src = "images/filtro_over.gif"
cerrar_off = new Image(); cerrar_off.src = "images/cerrar_off.gif"
cerrar_over = new Image(); cerrar_over.src = "images/cerrar_over.gif"
imprimir_off = new Image(); imprimir_off.src = "images/imprimir_off.gif"
imprimir_over = new Image(); imprimir_over.src = "images/imprimir_over.gif"

}

function turn_off(ImageName) {
	if (document.images != null) {
		document[ImageName].src = eval(ImageName + "_off.src");
	}
}

function turn_over(ImageName) {
	if (document.images != null) {
		document[ImageName].src = eval(ImageName + "_over.src");
	}
}