insert link in avl tree

[chris896]

Hey guys, i need some help with avl trees... how can i insert a link x y in these trees ?? I already have code for inserting a node but i can't find something about a link... Also, i should open an input.txt to read links.

this is my code for a node x :

void bstree::insert(int x,nodeptr &p)
{
if (p == NULL)
{
p = new node;
p->element = x;
p->left=NULL;
p->right = NULL;
p->height=0;
if (p==NULL)
{
cout<<"Out of Space\n"<<endl;
}
}
else
{
if (x<p->element)
{
insert(x,p->left);
if ((bsheight(p->left) - bsheight(p->right))==2)
{
if (x < p->left->element)
{
p=srl(p);
}
else
{
p = drl(p);
}
}
}
else if (x>p->element)
{
insert(x,p->right);
if ((bsheight(p->right) - bsheight(p->left))==2)
{
if (x > p->right->element)
{
p=srr(p);
}
else
{
p = drr(p);
}
}
}
else
{
cout<<"Element Exists\n"<<endl;
}
}