Polygon Filling with given vertices

Question

FIRST:

>

glBegin(GL_LINE_LOOP);
      glColor3f(0.0f,0.0f,1.0f);
      for (int i=0; i<sk; i++){
        glVertex2f((float)ok[i][0],(float)ok[i][1]);
      }
glEnd();

The int ok[][] array (sk is the array's size) has the given vertices,I want to draw the inside of triangles in blue color. When I try with GL_POLYGON the output is this :

WITH GL_POLYGON:

I want to draw just the inside of the blue line to fill these triangles.