if (document.images) {

var img1 = new Image();
img1.src = "images/sketch-pictures/1.jpg";
var img2 = new Image();
img2.src = "images/sketch-pictures/2.jpg";
var img3 = new Image();
img3.src = "images/sketch-pictures/3.jpg";
var img4 = new Image();
img4.src = "images/sketch-pictures/4.jpg";
var img5 = new Image();
img5.src = "images/sketch-pictures/5.jpg";

}


function imageswap1() {
	if (document.images) {
		document["drawing"].src = img1.src;
	}
}

function imageswap2() {
	if (document.images) {
		document["drawing"].src = img2.src;
	}
}

function imageswap3() {
	if (document.images) {
		document["drawing"].src = img3.src;
	}
}

function imageswap4() {
	if (document.images) {
		document["drawing"].src = img4.src;
	}
}

function imageswap5() {
	if (document.images) {
		document["drawing"].src = img5.src;
	}
}