Old C18 Code

//**********************************************
//********** HIGH PRIORITY INTERRUPTS **********
//**********************************************
#pragma code highVector=0x08
void athighvector (void)
{
	_asm 	GOTO	interruptisrh	_endasm
}
#pragma code

//*********************************************
//********** LOW PRIORITY INTERRUPTS **********
//*********************************************
#pragma code lowVector=0x18
void atlowvector (void)
{
	_asm	goto	interruptisrl	_endasm
}
#pragma code // give back code control

New XC8 Code

Dont' bother with the seperate functions to cause the jump as the specified program memory locations, just define your interrupt functions directly as follows and the compiler will take care of it.

//**********************************************
//********** HIGH PRIORITY INTERRUPTS **********
//**********************************************
void interrupt interruptisrh (void)
{
	
}	


//*********************************************
//********** LOW PRIORITY INTERRUPTS **********
//*********************************************
void interrupt low_priority interruptisrl (void)
{
	
}

(Remember to update the function definitions in your header fine to match).