function preloadImgs(){
	img_files = preloadImgs.arguments;
	arg_len = img_files.length;
	img_put = new Array;
	for(i=0;i<arg_len;i++){
		img_put[i] = new Image;
		img_put[i].src = img_files[i];
	}
}

function chgImg(imgnam,img){
	
	if(document.images){
		document.images[imgnam].src = img;
	}

}