if(document.images) {
generalinfo = new Image
membersarea = new Image
course = new Image
contact = new Image
useful = new Image

generalinfo.src = "/images/mainnav_generalinfo_onstate.gif"
membersarea.src = "/images/mainnav_membersarea_onstate.gif"
course.src = "/images/mainnav_course_onstate.gif"
contact.src = "/images/mainnav_contact_onstate.gif"
useful.src = "/images/mainnav_usefullinks_onstate.gif"

generalinfoOff = new Image
membersareaOff = new Image
courseOff = new Image
contactOff = new Image
usefulOff = new Image

generalinfoOff.src = "/images/mainnav_generalinfo.gif"
membersareaOff.src = "/images/mainnav_membersarea.gif"
courseOff.src = "/images/mainnav_course.gif"
contactOff.src = "/images/mainnav_contact.gif"
usefulOff.src = "/images/mainnav_usefullinks.gif"

generalinfoOn = new Image
membersareaOn = new Image
courseOn = new Image
contactOn = new Image
usefulOn = new Image

generalinfoOn.src = "/images/mainnav_generalinfo_onstate.gif"
membersareaOn.src = "/images/mainnav_membersarea_onstate.gif"
courseOn.src = "/images/mainnav_course_onstate.gif"
contactOn.src = "/images/mainnav_contact_onstate.gif"
usefulOn.src = "/images/mainnav_usefullinks_onstate.gif"
}

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