Call action with a link in the admin site

[Juan Antonio García Cano]

In the admin.py i have this function:

actions = ['generar_pdf']
def generar_pdf(self, request, queryset):

... (This function make a PDF of the object selected)

And i show one button in the list_display (of the admin site) with this 
function:

def boton_mail(self,obj):
                return mark_safe('<center><img 
src="http://mypage/static/admin/img/descargar_pdf.png"; alt="Descargar PDF" 
width=30 height=25></center>')

It is posible to call the function "generar_pdf" with a link (< a >) in the 
function "boton_mail"?

(I want to call the action from a image in the list display in the admin 
site)

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