window.onload = function(){
	ROfunction('rover', '');
}

function ROfunction(classname, prefix){

	var imgNum = document.getElementsByTagName("img");
	var inputNum = document.getElementsByTagName("input");
	
	overNum = new Array;
	
	if(prefix == ''){
		prefix = '_o';
	}
	
	for (i = 0; i < imgNum.length; i++) {
		overNum[i] = imgNum[i];
	}
	
	for (i = 0; i < inputNum.length; i++) {
		overNum[i + imgNum.length] = inputNum[i];
	}
	
	for (i = 0; i < overNum.length; i++) {
		if (overNum[i].className.indexOf(classname) != -1 && overNum[i].src.indexOf(prefix + ".") == -1) {
			overNum[i].overimg = new Image();
			if (overNum[i].className.indexOf(":") != -1) {
				Replace = overNum[i].className.split(":");
				Replace = Replace[1].split(" ");
				overNum[i].overimg.src = Replace[0];
			}
			else {
				Replace = overNum[i].src.length;
				overNum[i].overimg.src = overNum[i].src.substring(0, Replace - 4) + prefix + overNum[i].src.substring(Replace - 4, Replace);
			}
			overNum[i].setAttribute("out", overNum[i].src);
			overNum[i].onmouseover = new Function('this.src=this.overimg.src;');
			overNum[i].onmouseout = new Function('this.src=this.getAttribute("out");');
		}
	}
}