if (document.images) {
	btnhoma = new Image
	btngera = new Image
	btngala = new Image
	btnstfa = new Image
	btnsera = new Image
	btnposa = new Image
	btnlina = new Image

	btnhoma.src = "btnhoma.gif"
	btnsera.src = "btnsera.gif"
	btngala.src = "btngala.gif"
	btnstfa.src = "btnstfa.gif"
	btnposa.src = "btnposa.gif"
	btnlina.src = "btnlina.gif"

	btnhomb = new Image
	btnserb = new Image
	btngalb = new Image
	btnstfb = new Image
	btnposb = new Image
	btnlinb = new Image

	btnhomb.src = "btnhomb.gif"
	btnserb.src = "btnserb.gif"
	btngalb.src = "btngalb.gif"
	btnstfb.src = "btnstfb.gif"
	btnposb.src = "btnposb.gif"
	btnlinb.src = "btnlinb.gif"
	}

function chgImg(imgField,newImg){
	if (document.images){
	document[imgField].src= eval(newImg + ".src")
		}
	}