lcd is showing black boxes on pic16f877a

Code C - [expand]
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#include<pic16f877a.h>
 
// PIC16F877A Configuration Bit Settings
 
// 'C' source line config statements
 
#include <xc.h>
 
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
 
// CONFIG
#pragma config FOSC = HS        // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = ON       // Brown-out Reset Enable bit (BOR enabled)
#pragma config LVP = ON         // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3/PGM pin has PGM function; low-voltage programming enabled)
#pragma config CPD = OFF        // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF        // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)
 
 
 
#define datal PORTB
#define rs PORTDbits.RD5
#define rw PORTDbits.RD6
#define e PORTDbits.RD7
void Delay(unsigned int time);
void main(void)
{
    TRISB=0x00;
    PORTB=0x00;
    TRISD=0x00;
    PORTD=0x00;
    Delay(5000);
    e=0;
    Delay(5000);
    datal=0x38;
    rs=0;
    rw=0;
    e=1;
    Delay(5000);
    e=0;
    Delay(5000);
    datal=0x0F;
    rs=0;
    rw=0;
    e=1;
    Delay(5000);
    e=0;
    Delay(5000);
    datal=0x01;
    rs=0;
    rw=0;
    e=1;
    Delay(5000);
    e=0;
    Delay(5000);
    datal=0x06;
    rs=0;
    rw=0;
    e=1;
    Delay(5000);
    e=0;
    Delay(5000);
    datal='s';
    rs=1;
    rw=0;
    e=1;
    Delay(5000);
    e=0;
    Delay(5000);
    while(1)
    {
        PORTDbits.RD0=0;
        Delay(1000);
        PORTDbits.RD0=1;
        Delay(1000);
    }
}
 
 
void Delay(unsigned int time)
{
    int i,j;
    for(i=0;i<time;i++)
        for(j=0;j<165;j++);
}