how to get the values from multipicklist field and check the field the have particular value selected in if condidition using client script

how to get the values from multipicklist field and check the field the have particular value selected in if condidition using client script

how to  get the values from multipicklist  field and  check the field the have particular value selected in if condidition using client script.

Data base region  contain  saudi means make all the address field  mandatory .The code i have used not working Fine

Data base region  field type is multi select.