ADELAIDE, May 4 - One in five say they are not confident handling mental health issues in their students, according to the beyondblue survey of 600 teachers and principals.

In response, the charity mental health organisation is launching a redeveloped MindMatters initiative.

The program provides secondary school staff with online resources and personal support to help improve the mental health and wellbeing of students.

The organisation's chairman Jeff Kennett said MindMatters makes this a priority through online training, which is manageable for teachers who are already time-poor.

beyondblue board director Julia Gillard said evidence suggests that half of mental health conditions emerge by age 14, so working with impressionable young students is vitally important.

The former Prime Minister will be among the guests at the launch on Monday at Adelaide's Unley High School, which she attended in the 1970s.