function checkEmailAddress(c,a){var b=false;if(!c){return true}if(c.value.length==0){if(a!="Y"){return true}else{b=true}}if(!b&&c.value.replace(/^\s+/g,"").replace(/\s+$/g,"").search(email_validation_regexp)==-1){b=true}if(b){alert(txt_email_invalid);c.focus();c.select()}return !b};