function html_esc(str){var entity={"'":"&apos;",'"':"&quot;","<":"&lt;",">":"&gt;"};for(var e in entity){str=str.replace(new RegExp(e,"g"),entity[e])}return str}function esc_length_ok(str,len){return(html_esc(str).length<=len)}function checkEmail(email){if(!email){return true}if(email.value==""){alert("Please enter your email address.");email.focus()}else{if(/^\w+([\.-]\w+)*@\w+([\.-]\w+)*\.\w{2,}$/.test(email.value)){return true}else{alert("Please enter a valid email address.");email.focus()}}return false}function amz_js_PopWin(url,name,options){var winHelp=window.open(url,name,options);if(winHelp){winHelp.opener=this;winHelp.focus()}};