if (document.images) {

function hot() {
	var img = hot.arguments;
	for (var i=0; i<img.length; i+=2) {
    	  eval( 'document.' + img[i] + '.src = ' + img[i+1]  + '_hot.src' ) ; 
	}
}

function cold() {
	var img = cold.arguments;
	for (var i=0; i<img.length; i+=2) {
    	  eval( 'document.' + img[i] + '.src = ' + img[i+1]  + '_cold.src' ) ; 
	}
}
}