void ImportAsciiBlocks(int nTextLines, int nDataLines)
{
	ASCIMP    ascimp;
	string strFile = GetOpenBox("*.txt");
	int BlockSize = nTextLines + nDataLines;
	if(AscImpReadFileStruct(strFile,&ascimp)!=0)
	{
		out_str("cannot read ascii file");
		return;
	}	
	ascimp.iHeaderLines = 0;
	ascimp.iSubHeaderLines = 0;
	ascimp.iAutoSubHeaderLines = 0;
	ascimp.iRenameCols = 0; 
	ascimp.iRenameWks = 0;
	ascimp.iPartial = 1;
	ascimp.iPartialC1 = 0;
	ascimp.iPartialC2 = 1;
	int i;
	Worksheet wks;
	do
	{
		wks.Create();
		ascimp.iPartialR1 = i*BlockSize + nTextLines;
		ascimp.iPartialR2 = (i + 1)*BlockSize - 1;
		i++;
	} while ( !wks.ImportASCII(strFile, ascimp) );
	wks.Destroy(); // last wks will be empty
}