MIDEAST STOCKS-Saudi Arabia slips with oil, Egypt rebounds

(Updates with Saudi Arabia, Egypt open) DUBAI, Feb 18 (Reuters) - Saudi Arabia's stock market struggled to hold on to early gains on Wednesday, while Egypt rebounded after a profit-taking bout. Saudi Basic Industries, the Gulf's biggest petrochemicals firm, fell 0.8 percent. Saudi Arabia's National Industrialization Co (Tasnee) fell 1.3 percent after it proposed a 2014 dividend of 1.00 riyal per share, down from 1.50 riyals a year earlier. With year-to-date gains of 13.3 percent, Saudi Arabia ha