My huge conditional statement causing errors!

if((first_name==undefined || first_name.trim()=="") || (last_name==undefined || last_name.trim()=="") || (street==undefined || street.trim()=="") || (suburb==undefined || suburb.trim()=="") || (postcode==undefined || postcode.trim()=="") || (state==undefined || state.trim()=="") || (country==undefined || country.trim()=="") || (area_code==undefined || area_code.trim()=="") ||(business_ph==undefined || business_ph.trim()=**[COLOR=Red]=[/COLOR]**"") || (title==undefined || title.trim()=="") || (company==undefined || company.trim()=="") || (email_address1==undefined || email_address1.trim()=="") || (email_address2==undefined || email_address2.trim()=="")){