string placeholder replacement function

printReplace

printReplace=function(str,vars){
	if( typeof vars !== 'object' ){
		return str;
	}
	return str.replace(/(%+)([a-z0-9_-]+)/g,function(m,p,k){
		if( p.length === 1 && typeof vars[k] !== 'undefined'){
			return vars[k] || '';
		}
		return m;
	});
}
String.prototype.printReplace = function(vars){ return printReplace(this,vars); };