var maxx = 875;
var maxy = 725;
var originalx = 0;
var originaly = 0;
var resized = false;

function resize() {
	var img = document.getElementById('image');
	if(resized){
		img.width = originalx;
		img.height = originaly;
		resized = false;
	}
	else {
		if(img.width > maxx) {
			newy = parseInt((maxx * img.height) / img.width , 10);
			newx = maxx;
			
			if(newy > maxy) {
				newy = maxy;
				newx = parseInt((maxy * img.width) / img.height, 10);
			}
		}
		else if(img.height > maxy) {
			newx = parseInt((maxy * img.width) / img.height , 10);
			newy = maxy;
			
			if(newx > maxx) {
				newy = parseInt((maxx * img.height) / img.width , 10);
				newx = maxx;
			}
		}
		
		originalx = img.width;
		originaly = img.height;
		img.width = newx;
		img.height = newy;
		resized = true;
	}
}