function ChangeBack(cn) {
	if(document.getElementById){
		document.getElementById("ci" + cn).src='./images/science_ilon' + cn + '.jpg';
	}
}

function BackBack(cn) {
	if(document.getElementById){
		document.getElementById("ci" + cn).src='./images/science_il' + cn + '.jpg';
	}
}

function ChangeImage(cn) {
	if(document.getElementById){
		document.getElementById("ci" + cn).src='./images/history_ilon' + cn + '.jpg';
	}
}

function BackImage(cn) {
	if(document.getElementById){
		document.getElementById("ci" + cn).src='./images/history_il' + cn + '.jpg';
	}
}