window.onload = others;

function others()
{
	others_pushedbtn();
	
}
function others_pushedbtn()
{
	var els = document.getElementsByTagName('img');
	for (var i=0, imax=els.length; i<imax; i++)
	{
		var el = els[i];
		if (/\bpushedbtn\b/i.test(el.className))
		{
			eval("img_"+i+" = new Image(); img_"+i+".src = el.src.replace(/_up./i, '_down.');")
			el.onmousedown = new Function("this.src = this.src.replace(/_up./i, '_down.')");
			el.onmouseup = new Function("this.src = this.src.replace(/_down./i, '_up.')");
			el.onmouseout = new Function("this.src = this.src.replace(/_down./i, '_up.')");
		}
	}
}