Maybe this (in C2 is a array formula - use Ctrl+Shift+Enter and not only Enter):
<b>Excel 2007</b><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #A6AAB6"><colgroup><col width="25px" style="background-color: #E0E0F0" /><col /><col /><col /><col /><col /></colgroup><thead><tr style=" background-color: #E0E0F0;text-align: center;color: #161120"><th></th><th>A</th><th>B</th><th>C</th><th>D</th><th>E</th></tr></thead><tbody><tr ><td style="color: #161120;text-align: center;">1</td><td style="text-align: center;background-color: #C5D9F1;;">Transaction Date</td><td style="text-align: center;background-color: #C5D9F1;;">Value</td><td style="text-align: center;background-color: #C5D9F1;;">Invoice #</td><td style="text-align: right;;"></td><td style="text-align: center;background-color: #C5D9F1;;">If statement</td></tr><tr ><td style="color: #161120;text-align: center;">2</td><td style="text-align: center;;">1/1/2011</td><td style="text-align: center;;">5100</td><td style="text-align: center;;">50100</td><td style="text-align: right;;"></td><td style="text-align: center;;">0</td></tr><tr ><td style="color: #161120;text-align: center;">3</td><td style="text-align: center;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">4</td><td style="text-align: center;;">*******</td><td style="text-align: center;;">*******</td><td style="text-align: center;;">*******</td><td style="text-align: center;;">*******</td><td style="text-align: center;;">*******</td></tr></tbody></table><p style="width:4.2em;font-weight:bold;margin:0;padding:0.2em 0.6em 0.2em 0.5em;border: 1px solid #A6AAB6;border-top:none;text-align: center;background-color: #E0E0F0;color: #161120">Sheet21</p><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: #FFFFFF" ><tr><td style="padding:6px" ><b>Worksheet Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: #FFFFFF;border-collapse: collapse; border-color: #A6AAB6"><thead><tr style=" background-color: #E0E0F0;color: #161120"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">E2</th><td style="text-align:left">=1*OR(<font color="Blue">A1="Pj",A1="ps"</font>)</td></tr></tbody></table></td></tr></table><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: #FFFFFF" ><tr><td style="padding:6px" ><b>Array Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: #FFFFFF;border-collapse: collapse; border-color: #A6AAB6"><thead><tr style=" background-color: #E0E0F0;color: #161120"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">C2</th><td style="text-align:left">{=INDEX(<font color="Blue">Sheet2!A2:A10,MATCH(<font color="Red">A2&B2,Sheet2!$B$2:$B$10&Sheet2!$D$2:$D$10,0</font>)</font>)}</td></tr></tbody></table><b>Entered with Ctrl+Shift+Enter.</b> If entered correctly, Excel will surround with curly braces {}.
<b>Note: Do not try and enter the {} manually yourself</b></td></tr></table><br />
Markmzz