function changeStyle(element, attribute, value) {
				document.getElementById(element).style[attribute] = value; }
				
	function changeSource(element, source) {
				document.getElementById(element).src = source; }
	
	function clickChk(obj)
	{
		var fic = RegExp("(nonCoche.gif)$","gi");
 
 
		if (fic.test(obj.src))
			obj.src = "images/coche.gif";
		else
			obj.src = "images/nonCoche.gif"
	}
	
	function fadeimage(idimg)
	{
		var level = 0;
		changeStyle(idimg, 'opacity', '0.0');
		changeStyle(idimg, 'visibility', 'visible');
  		while(level <= 1)
  			{
        		var MyTimeout = setTimeout( "changeStyle('"+idimg+"', 'opacity', "+level+")", (level* 1000) + 10);
        		level += 0.01;
        	}
	}
	
	function turnImgCheck(objCheck)
	{
   		var img = document.getElementById('img_check_' + objCheck.id);
   		var t = img.src.split('/');
    	img.src = (t[t.length-1] == 'off_check.gif') ? 'on_check.gif' : 'off_check.gif';
	}