function toggleOpacity(elem , activate)
{	

	if(elem)
	{	
		if(activate)
		{		
			elem.style.filter="alpha(opacity=80)";
			elem.setAttribute("style" , "-moz-opacity:.80;opacity:.80;");
		}
		else
		{
			elem.style.filter="alpha(opacity=100)";
			elem.setAttribute("style" , "-moz-opacity:100;opacity:100;");
		}
	}

}

function strToHtml(string) 
{
	var out = "";
	for( var i=0; i<string.length; i++)
	{
		if(string.charCodeAt(i)>127)
			out += '&#' + string.charCodeAt(i) + ';';
		else
			out += string.charAt(i);
	}
	return out ;
}
function toUtf8(src)
{
	var dest = "";
	var curr ="";
	
	for(var i=0 ; i<src.length ; i++)
	{
		curr="";
		
		curr=src.charAt(i);
		curr1 = src.charAt(i+1);
	
		if( curr=="&" && curr1=="#" ) //lookahead
		{
			//run until find ';'
			tmp = "";
			var j =0;
			for( j=i+2 ; j<src.length ; j++ )
			{
				curr2 = src.charAt(j);
				
				if( curr2==";" )
					break;
					
				tmp += curr2;
			}
			if( !isNaN(tmp) )
			{
				dest += String.fromCharCode(tmp);
				i = j;
			}
			else
				dest+=curr;
		}
		else
			dest+=curr;
	}
	
	return dest;
}

function resetFieldsClass(form)
{
	var curr = null;
	for( var i=0 ; i<form.length ; i++)
	{
		curr = form[i];
		
		if( curr.type !="hidden" && curr.type !="submit" && curr.type !="button" )
		{
			changeClass(curr , "txtBig") ;
		}
	}

}

function changeFieldsClass(form,codes)
{
	var curr = null;
	for( var i=0 ; i<codes.length ; i++)
	{
		curr = form[ codes[i] ];
		
		if( curr.type!="hidden" && curr.type !="submit" && curr.type !="button" )
		{
			if(codes[i]=="9")
				alert(curr.name);
			if(codes[i]=="7")
			{
				changeClass( form.bistrot_pren_day   , "txtBig_error") ;
				changeClass( form.bistrot_pren_month , "txtBig_error") ;
				changeClass( form.bistrot_pren_year  , "txtBig_error") ;
				
				//changeClass( form.bistrot_pren_hm    , "txtBig_error") ;
			}
			else
				changeClass(curr , "txtBig_error") ;
		}
	}
}


function changeClass( elem , new_class )
{
	var type = typeof(elem) ;
	var el = null;
	
	if(type=="string")
		el = getId( elem );	
	else
		el = elem
	
	if(el)
	{
		el.removeAttribute("class");
		var cls = document.createAttribute( "class" );
		cls.value = new_class ;
		el.setAttributeNode( cls );
	}
}