function roll_over(img_name, img_src){
   document[img_name].src = img_src;
}

function chgBigSize(imgName){
	document[imgName].height = 50; 
}

function chgSmallSize(imgName){
	document[imgName].height = 25; 
}

function showDiamond(id){
	document.getElementById(id).innerHTML = "♦ ";
}

function hideDiamond(id){
	document.getElementById(id).innerHTML = " ";
}